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-rw-r--r--vendor/thiserror-impl/src/ast.rs161
-rw-r--r--vendor/thiserror-impl/src/attr.rs210
-rw-r--r--vendor/thiserror-impl/src/expand.rs562
-rw-r--r--vendor/thiserror-impl/src/fmt.rs170
-rw-r--r--vendor/thiserror-impl/src/generics.rs83
-rw-r--r--vendor/thiserror-impl/src/lib.rs36
-rw-r--r--vendor/thiserror-impl/src/prop.rs147
-rw-r--r--vendor/thiserror-impl/src/span.rs15
-rw-r--r--vendor/thiserror-impl/src/valid.rs237
9 files changed, 0 insertions, 1621 deletions
diff --git a/vendor/thiserror-impl/src/ast.rs b/vendor/thiserror-impl/src/ast.rs
deleted file mode 100644
index 9e06928..0000000
--- a/vendor/thiserror-impl/src/ast.rs
+++ /dev/null
@@ -1,161 +0,0 @@
-use crate::attr::{self, Attrs};
-use crate::generics::ParamsInScope;
-use proc_macro2::Span;
-use syn::{
- Data, DataEnum, DataStruct, DeriveInput, Error, Fields, Generics, Ident, Index, Member, Result,
- Type,
-};
-
-pub enum Input<'a> {
- Struct(Struct<'a>),
- Enum(Enum<'a>),
-}
-
-pub struct Struct<'a> {
- pub attrs: Attrs<'a>,
- pub ident: Ident,
- pub generics: &'a Generics,
- pub fields: Vec<Field<'a>>,
-}
-
-pub struct Enum<'a> {
- pub attrs: Attrs<'a>,
- pub ident: Ident,
- pub generics: &'a Generics,
- pub variants: Vec<Variant<'a>>,
-}
-
-pub struct Variant<'a> {
- pub original: &'a syn::Variant,
- pub attrs: Attrs<'a>,
- pub ident: Ident,
- pub fields: Vec<Field<'a>>,
-}
-
-pub struct Field<'a> {
- pub original: &'a syn::Field,
- pub attrs: Attrs<'a>,
- pub member: Member,
- pub ty: &'a Type,
- pub contains_generic: bool,
-}
-
-impl<'a> Input<'a> {
- pub fn from_syn(node: &'a DeriveInput) -> Result<Self> {
- match &node.data {
- Data::Struct(data) => Struct::from_syn(node, data).map(Input::Struct),
- Data::Enum(data) => Enum::from_syn(node, data).map(Input::Enum),
- Data::Union(_) => Err(Error::new_spanned(
- node,
- "union as errors are not supported",
- )),
- }
- }
-}
-
-impl<'a> Struct<'a> {
- fn from_syn(node: &'a DeriveInput, data: &'a DataStruct) -> Result<Self> {
- let mut attrs = attr::get(&node.attrs)?;
- let scope = ParamsInScope::new(&node.generics);
- let span = attrs.span().unwrap_or_else(Span::call_site);
- let fields = Field::multiple_from_syn(&data.fields, &scope, span)?;
- if let Some(display) = &mut attrs.display {
- display.expand_shorthand(&fields);
- }
- Ok(Struct {
- attrs,
- ident: node.ident.clone(),
- generics: &node.generics,
- fields,
- })
- }
-}
-
-impl<'a> Enum<'a> {
- fn from_syn(node: &'a DeriveInput, data: &'a DataEnum) -> Result<Self> {
- let attrs = attr::get(&node.attrs)?;
- let scope = ParamsInScope::new(&node.generics);
- let span = attrs.span().unwrap_or_else(Span::call_site);
- let variants = data
- .variants
- .iter()
- .map(|node| {
- let mut variant = Variant::from_syn(node, &scope, span)?;
- if let display @ None = &mut variant.attrs.display {
- *display = attrs.display.clone();
- }
- if let Some(display) = &mut variant.attrs.display {
- display.expand_shorthand(&variant.fields);
- } else if variant.attrs.transparent.is_none() {
- variant.attrs.transparent = attrs.transparent;
- }
- Ok(variant)
- })
- .collect::<Result<_>>()?;
- Ok(Enum {
- attrs,
- ident: node.ident.clone(),
- generics: &node.generics,
- variants,
- })
- }
-}
-
-impl<'a> Variant<'a> {
- fn from_syn(node: &'a syn::Variant, scope: &ParamsInScope<'a>, span: Span) -> Result<Self> {
- let attrs = attr::get(&node.attrs)?;
- let span = attrs.span().unwrap_or(span);
- Ok(Variant {
- original: node,
- attrs,
- ident: node.ident.clone(),
- fields: Field::multiple_from_syn(&node.fields, scope, span)?,
- })
- }
-}
-
-impl<'a> Field<'a> {
- fn multiple_from_syn(
- fields: &'a Fields,
- scope: &ParamsInScope<'a>,
- span: Span,
- ) -> Result<Vec<Self>> {
- fields
- .iter()
- .enumerate()
- .map(|(i, field)| Field::from_syn(i, field, scope, span))
- .collect()
- }
-
- fn from_syn(
- i: usize,
- node: &'a syn::Field,
- scope: &ParamsInScope<'a>,
- span: Span,
- ) -> Result<Self> {
- Ok(Field {
- original: node,
- attrs: attr::get(&node.attrs)?,
- member: node.ident.clone().map(Member::Named).unwrap_or_else(|| {
- Member::Unnamed(Index {
- index: i as u32,
- span,
- })
- }),
- ty: &node.ty,
- contains_generic: scope.intersects(&node.ty),
- })
- }
-}
-
-impl Attrs<'_> {
- pub fn span(&self) -> Option<Span> {
- if let Some(display) = &self.display {
- Some(display.fmt.span())
- } else if let Some(transparent) = &self.transparent {
- Some(transparent.span)
- } else {
- None
- }
- }
-}
diff --git a/vendor/thiserror-impl/src/attr.rs b/vendor/thiserror-impl/src/attr.rs
deleted file mode 100644
index 4beb8c9..0000000
--- a/vendor/thiserror-impl/src/attr.rs
+++ /dev/null
@@ -1,210 +0,0 @@
-use proc_macro2::{Delimiter, Group, Span, TokenStream, TokenTree};
-use quote::{format_ident, quote, ToTokens};
-use std::collections::BTreeSet as Set;
-use syn::parse::ParseStream;
-use syn::{
- braced, bracketed, parenthesized, token, Attribute, Error, Ident, Index, LitInt, LitStr, Meta,
- Result, Token,
-};
-
-pub struct Attrs<'a> {
- pub display: Option<Display<'a>>,
- pub source: Option<&'a Attribute>,
- pub backtrace: Option<&'a Attribute>,
- pub from: Option<&'a Attribute>,
- pub transparent: Option<Transparent<'a>>,
-}
-
-#[derive(Clone)]
-pub struct Display<'a> {
- pub original: &'a Attribute,
- pub fmt: LitStr,
- pub args: TokenStream,
- pub has_bonus_display: bool,
- pub implied_bounds: Set<(usize, Trait)>,
-}
-
-#[derive(Copy, Clone)]
-pub struct Transparent<'a> {
- pub original: &'a Attribute,
- pub span: Span,
-}
-
-#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug)]
-pub enum Trait {
- Debug,
- Display,
- Octal,
- LowerHex,
- UpperHex,
- Pointer,
- Binary,
- LowerExp,
- UpperExp,
-}
-
-pub fn get(input: &[Attribute]) -> Result<Attrs> {
- let mut attrs = Attrs {
- display: None,
- source: None,
- backtrace: None,
- from: None,
- transparent: None,
- };
-
- for attr in input {
- if attr.path().is_ident("error") {
- parse_error_attribute(&mut attrs, attr)?;
- } else if attr.path().is_ident("source") {
- attr.meta.require_path_only()?;
- if attrs.source.is_some() {
- return Err(Error::new_spanned(attr, "duplicate #[source] attribute"));
- }
- attrs.source = Some(attr);
- } else if attr.path().is_ident("backtrace") {
- attr.meta.require_path_only()?;
- if attrs.backtrace.is_some() {
- return Err(Error::new_spanned(attr, "duplicate #[backtrace] attribute"));
- }
- attrs.backtrace = Some(attr);
- } else if attr.path().is_ident("from") {
- match attr.meta {
- Meta::Path(_) => {}
- Meta::List(_) | Meta::NameValue(_) => {
- // Assume this is meant for derive_more crate or something.
- continue;
- }
- }
- if attrs.from.is_some() {
- return Err(Error::new_spanned(attr, "duplicate #[from] attribute"));
- }
- attrs.from = Some(attr);
- }
- }
-
- Ok(attrs)
-}
-
-fn parse_error_attribute<'a>(attrs: &mut Attrs<'a>, attr: &'a Attribute) -> Result<()> {
- syn::custom_keyword!(transparent);
-
- attr.parse_args_with(|input: ParseStream| {
- if let Some(kw) = input.parse::<Option<transparent>>()? {
- if attrs.transparent.is_some() {
- return Err(Error::new_spanned(
- attr,
- "duplicate #[error(transparent)] attribute",
- ));
- }
- attrs.transparent = Some(Transparent {
- original: attr,
- span: kw.span,
- });
- return Ok(());
- }
-
- let display = Display {
- original: attr,
- fmt: input.parse()?,
- args: parse_token_expr(input, false)?,
- has_bonus_display: false,
- implied_bounds: Set::new(),
- };
- if attrs.display.is_some() {
- return Err(Error::new_spanned(
- attr,
- "only one #[error(...)] attribute is allowed",
- ));
- }
- attrs.display = Some(display);
- Ok(())
- })
-}
-
-fn parse_token_expr(input: ParseStream, mut begin_expr: bool) -> Result<TokenStream> {
- let mut tokens = Vec::new();
- while !input.is_empty() {
- if begin_expr && input.peek(Token![.]) {
- if input.peek2(Ident) {
- input.parse::<Token![.]>()?;
- begin_expr = false;
- continue;
- }
- if input.peek2(LitInt) {
- input.parse::<Token![.]>()?;
- let int: Index = input.parse()?;
- let ident = format_ident!("_{}", int.index, span = int.span);
- tokens.push(TokenTree::Ident(ident));
- begin_expr = false;
- continue;
- }
- }
-
- begin_expr = input.peek(Token![break])
- || input.peek(Token![continue])
- || input.peek(Token![if])
- || input.peek(Token![in])
- || input.peek(Token![match])
- || input.peek(Token![mut])
- || input.peek(Token![return])
- || input.peek(Token![while])
- || input.peek(Token![+])
- || input.peek(Token![&])
- || input.peek(Token![!])
- || input.peek(Token![^])
- || input.peek(Token![,])
- || input.peek(Token![/])
- || input.peek(Token![=])
- || input.peek(Token![>])
- || input.peek(Token![<])
- || input.peek(Token![|])
- || input.peek(Token![%])
- || input.peek(Token![;])
- || input.peek(Token![*])
- || input.peek(Token![-]);
-
- let token: TokenTree = if input.peek(token::Paren) {
- let content;
- let delimiter = parenthesized!(content in input);
- let nested = parse_token_expr(&content, true)?;
- let mut group = Group::new(Delimiter::Parenthesis, nested);
- group.set_span(delimiter.span.join());
- TokenTree::Group(group)
- } else if input.peek(token::Brace) {
- let content;
- let delimiter = braced!(content in input);
- let nested = parse_token_expr(&content, true)?;
- let mut group = Group::new(Delimiter::Brace, nested);
- group.set_span(delimiter.span.join());
- TokenTree::Group(group)
- } else if input.peek(token::Bracket) {
- let content;
- let delimiter = bracketed!(content in input);
- let nested = parse_token_expr(&content, true)?;
- let mut group = Group::new(Delimiter::Bracket, nested);
- group.set_span(delimiter.span.join());
- TokenTree::Group(group)
- } else {
- input.parse()?
- };
- tokens.push(token);
- }
- Ok(TokenStream::from_iter(tokens))
-}
-
-impl ToTokens for Display<'_> {
- fn to_tokens(&self, tokens: &mut TokenStream) {
- let fmt = &self.fmt;
- let args = &self.args;
- tokens.extend(quote! {
- ::core::write!(__formatter, #fmt #args)
- });
- }
-}
-
-impl ToTokens for Trait {
- fn to_tokens(&self, tokens: &mut TokenStream) {
- let trait_name = format_ident!("{}", format!("{:?}", self));
- tokens.extend(quote!(::core::fmt::#trait_name));
- }
-}
diff --git a/vendor/thiserror-impl/src/expand.rs b/vendor/thiserror-impl/src/expand.rs
deleted file mode 100644
index 1b44513..0000000
--- a/vendor/thiserror-impl/src/expand.rs
+++ /dev/null
@@ -1,562 +0,0 @@
-use crate::ast::{Enum, Field, Input, Struct};
-use crate::attr::Trait;
-use crate::generics::InferredBounds;
-use crate::span::MemberSpan;
-use proc_macro2::TokenStream;
-use quote::{format_ident, quote, quote_spanned, ToTokens};
-use std::collections::BTreeSet as Set;
-use syn::{DeriveInput, GenericArgument, Member, PathArguments, Result, Token, Type};
-
-pub fn derive(input: &DeriveInput) -> TokenStream {
- match try_expand(input) {
- Ok(expanded) => expanded,
- // If there are invalid attributes in the input, expand to an Error impl
- // anyway to minimize spurious knock-on errors in other code that uses
- // this type as an Error.
- Err(error) => fallback(input, error),
- }
-}
-
-fn try_expand(input: &DeriveInput) -> Result<TokenStream> {
- let input = Input::from_syn(input)?;
- input.validate()?;
- Ok(match input {
- Input::Struct(input) => impl_struct(input),
- Input::Enum(input) => impl_enum(input),
- })
-}
-
-fn fallback(input: &DeriveInput, error: syn::Error) -> TokenStream {
- let ty = &input.ident;
- let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
-
- let error = error.to_compile_error();
-
- quote! {
- #error
-
- #[allow(unused_qualifications)]
- impl #impl_generics std::error::Error for #ty #ty_generics #where_clause
- where
- // Work around trivial bounds being unstable.
- // https://github.com/rust-lang/rust/issues/48214
- for<'workaround> #ty #ty_generics: ::core::fmt::Debug,
- {}
-
- #[allow(unused_qualifications)]
- impl #impl_generics ::core::fmt::Display for #ty #ty_generics #where_clause {
- fn fmt(&self, __formatter: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
- ::core::unreachable!()
- }
- }
- }
-}
-
-fn impl_struct(input: Struct) -> TokenStream {
- let ty = &input.ident;
- let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
- let mut error_inferred_bounds = InferredBounds::new();
-
- let source_body = if let Some(transparent_attr) = &input.attrs.transparent {
- let only_field = &input.fields[0];
- if only_field.contains_generic {
- error_inferred_bounds.insert(only_field.ty, quote!(std::error::Error));
- }
- let member = &only_field.member;
- Some(quote_spanned! {transparent_attr.span=>
- std::error::Error::source(self.#member.as_dyn_error())
- })
- } else if let Some(source_field) = input.source_field() {
- let source = &source_field.member;
- if source_field.contains_generic {
- let ty = unoptional_type(source_field.ty);
- error_inferred_bounds.insert(ty, quote!(std::error::Error + 'static));
- }
- let asref = if type_is_option(source_field.ty) {
- Some(quote_spanned!(source.member_span()=> .as_ref()?))
- } else {
- None
- };
- let dyn_error = quote_spanned! {source_field.source_span()=>
- self.#source #asref.as_dyn_error()
- };
- Some(quote! {
- ::core::option::Option::Some(#dyn_error)
- })
- } else {
- None
- };
- let source_method = source_body.map(|body| {
- quote! {
- fn source(&self) -> ::core::option::Option<&(dyn std::error::Error + 'static)> {
- use thiserror::__private::AsDynError as _;
- #body
- }
- }
- });
-
- let provide_method = input.backtrace_field().map(|backtrace_field| {
- let request = quote!(request);
- let backtrace = &backtrace_field.member;
- let body = if let Some(source_field) = input.source_field() {
- let source = &source_field.member;
- let source_provide = if type_is_option(source_field.ty) {
- quote_spanned! {source.member_span()=>
- if let ::core::option::Option::Some(source) = &self.#source {
- source.thiserror_provide(#request);
- }
- }
- } else {
- quote_spanned! {source.member_span()=>
- self.#source.thiserror_provide(#request);
- }
- };
- let self_provide = if source == backtrace {
- None
- } else if type_is_option(backtrace_field.ty) {
- Some(quote! {
- if let ::core::option::Option::Some(backtrace) = &self.#backtrace {
- #request.provide_ref::<std::backtrace::Backtrace>(backtrace);
- }
- })
- } else {
- Some(quote! {
- #request.provide_ref::<std::backtrace::Backtrace>(&self.#backtrace);
- })
- };
- quote! {
- use thiserror::__private::ThiserrorProvide as _;
- #source_provide
- #self_provide
- }
- } else if type_is_option(backtrace_field.ty) {
- quote! {
- if let ::core::option::Option::Some(backtrace) = &self.#backtrace {
- #request.provide_ref::<std::backtrace::Backtrace>(backtrace);
- }
- }
- } else {
- quote! {
- #request.provide_ref::<std::backtrace::Backtrace>(&self.#backtrace);
- }
- };
- quote! {
- fn provide<'_request>(&'_request self, #request: &mut std::error::Request<'_request>) {
- #body
- }
- }
- });
-
- let mut display_implied_bounds = Set::new();
- let display_body = if input.attrs.transparent.is_some() {
- let only_field = &input.fields[0].member;
- display_implied_bounds.insert((0, Trait::Display));
- Some(quote! {
- ::core::fmt::Display::fmt(&self.#only_field, __formatter)
- })
- } else if let Some(display) = &input.attrs.display {
- display_implied_bounds = display.implied_bounds.clone();
- let use_as_display = use_as_display(display.has_bonus_display);
- let pat = fields_pat(&input.fields);
- Some(quote! {
- #use_as_display
- #[allow(unused_variables, deprecated)]
- let Self #pat = self;
- #display
- })
- } else {
- None
- };
- let display_impl = display_body.map(|body| {
- let mut display_inferred_bounds = InferredBounds::new();
- for (field, bound) in display_implied_bounds {
- let field = &input.fields[field];
- if field.contains_generic {
- display_inferred_bounds.insert(field.ty, bound);
- }
- }
- let display_where_clause = display_inferred_bounds.augment_where_clause(input.generics);
- quote! {
- #[allow(unused_qualifications)]
- impl #impl_generics ::core::fmt::Display for #ty #ty_generics #display_where_clause {
- #[allow(clippy::used_underscore_binding)]
- fn fmt(&self, __formatter: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
- #body
- }
- }
- }
- });
-
- let from_impl = input.from_field().map(|from_field| {
- let backtrace_field = input.distinct_backtrace_field();
- let from = unoptional_type(from_field.ty);
- let body = from_initializer(from_field, backtrace_field);
- quote! {
- #[allow(unused_qualifications)]
- impl #impl_generics ::core::convert::From<#from> for #ty #ty_generics #where_clause {
- #[allow(deprecated)]
- fn from(source: #from) -> Self {
- #ty #body
- }
- }
- }
- });
-
- if input.generics.type_params().next().is_some() {
- let self_token = <Token![Self]>::default();
- error_inferred_bounds.insert(self_token, Trait::Debug);
- error_inferred_bounds.insert(self_token, Trait::Display);
- }
- let error_where_clause = error_inferred_bounds.augment_where_clause(input.generics);
-
- quote! {
- #[allow(unused_qualifications)]
- impl #impl_generics std::error::Error for #ty #ty_generics #error_where_clause {
- #source_method
- #provide_method
- }
- #display_impl
- #from_impl
- }
-}
-
-fn impl_enum(input: Enum) -> TokenStream {
- let ty = &input.ident;
- let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
- let mut error_inferred_bounds = InferredBounds::new();
-
- let source_method = if input.has_source() {
- let arms = input.variants.iter().map(|variant| {
- let ident = &variant.ident;
- if let Some(transparent_attr) = &variant.attrs.transparent {
- let only_field = &variant.fields[0];
- if only_field.contains_generic {
- error_inferred_bounds.insert(only_field.ty, quote!(std::error::Error));
- }
- let member = &only_field.member;
- let source = quote_spanned! {transparent_attr.span=>
- std::error::Error::source(transparent.as_dyn_error())
- };
- quote! {
- #ty::#ident {#member: transparent} => #source,
- }
- } else if let Some(source_field) = variant.source_field() {
- let source = &source_field.member;
- if source_field.contains_generic {
- let ty = unoptional_type(source_field.ty);
- error_inferred_bounds.insert(ty, quote!(std::error::Error + 'static));
- }
- let asref = if type_is_option(source_field.ty) {
- Some(quote_spanned!(source.member_span()=> .as_ref()?))
- } else {
- None
- };
- let varsource = quote!(source);
- let dyn_error = quote_spanned! {source_field.source_span()=>
- #varsource #asref.as_dyn_error()
- };
- quote! {
- #ty::#ident {#source: #varsource, ..} => ::core::option::Option::Some(#dyn_error),
- }
- } else {
- quote! {
- #ty::#ident {..} => ::core::option::Option::None,
- }
- }
- });
- Some(quote! {
- fn source(&self) -> ::core::option::Option<&(dyn std::error::Error + 'static)> {
- use thiserror::__private::AsDynError as _;
- #[allow(deprecated)]
- match self {
- #(#arms)*
- }
- }
- })
- } else {
- None
- };
-
- let provide_method = if input.has_backtrace() {
- let request = quote!(request);
- let arms = input.variants.iter().map(|variant| {
- let ident = &variant.ident;
- match (variant.backtrace_field(), variant.source_field()) {
- (Some(backtrace_field), Some(source_field))
- if backtrace_field.attrs.backtrace.is_none() =>
- {
- let backtrace = &backtrace_field.member;
- let source = &source_field.member;
- let varsource = quote!(source);
- let source_provide = if type_is_option(source_field.ty) {
- quote_spanned! {source.member_span()=>
- if let ::core::option::Option::Some(source) = #varsource {
- source.thiserror_provide(#request);
- }
- }
- } else {
- quote_spanned! {source.member_span()=>
- #varsource.thiserror_provide(#request);
- }
- };
- let self_provide = if type_is_option(backtrace_field.ty) {
- quote! {
- if let ::core::option::Option::Some(backtrace) = backtrace {
- #request.provide_ref::<std::backtrace::Backtrace>(backtrace);
- }
- }
- } else {
- quote! {
- #request.provide_ref::<std::backtrace::Backtrace>(backtrace);
- }
- };
- quote! {
- #ty::#ident {
- #backtrace: backtrace,
- #source: #varsource,
- ..
- } => {
- use thiserror::__private::ThiserrorProvide as _;
- #source_provide
- #self_provide
- }
- }
- }
- (Some(backtrace_field), Some(source_field))
- if backtrace_field.member == source_field.member =>
- {
- let backtrace = &backtrace_field.member;
- let varsource = quote!(source);
- let source_provide = if type_is_option(source_field.ty) {
- quote_spanned! {backtrace.member_span()=>
- if let ::core::option::Option::Some(source) = #varsource {
- source.thiserror_provide(#request);
- }
- }
- } else {
- quote_spanned! {backtrace.member_span()=>
- #varsource.thiserror_provide(#request);
- }
- };
- quote! {
- #ty::#ident {#backtrace: #varsource, ..} => {
- use thiserror::__private::ThiserrorProvide as _;
- #source_provide
- }
- }
- }
- (Some(backtrace_field), _) => {
- let backtrace = &backtrace_field.member;
- let body = if type_is_option(backtrace_field.ty) {
- quote! {
- if let ::core::option::Option::Some(backtrace) = backtrace {
- #request.provide_ref::<std::backtrace::Backtrace>(backtrace);
- }
- }
- } else {
- quote! {
- #request.provide_ref::<std::backtrace::Backtrace>(backtrace);
- }
- };
- quote! {
- #ty::#ident {#backtrace: backtrace, ..} => {
- #body
- }
- }
- }
- (None, _) => quote! {
- #ty::#ident {..} => {}
- },
- }
- });
- Some(quote! {
- fn provide<'_request>(&'_request self, #request: &mut std::error::Request<'_request>) {
- #[allow(deprecated)]
- match self {
- #(#arms)*
- }
- }
- })
- } else {
- None
- };
-
- let display_impl = if input.has_display() {
- let mut display_inferred_bounds = InferredBounds::new();
- let has_bonus_display = input.variants.iter().any(|v| {
- v.attrs
- .display
- .as_ref()
- .map_or(false, |display| display.has_bonus_display)
- });
- let use_as_display = use_as_display(has_bonus_display);
- let void_deref = if input.variants.is_empty() {
- Some(quote!(*))
- } else {
- None
- };
- let arms = input.variants.iter().map(|variant| {
- let mut display_implied_bounds = Set::new();
- let display = match &variant.attrs.display {
- Some(display) => {
- display_implied_bounds = display.implied_bounds.clone();
- display.to_token_stream()
- }
- None => {
- let only_field = match &variant.fields[0].member {
- Member::Named(ident) => ident.clone(),
- Member::Unnamed(index) => format_ident!("_{}", index),
- };
- display_implied_bounds.insert((0, Trait::Display));
- quote!(::core::fmt::Display::fmt(#only_field, __formatter))
- }
- };
- for (field, bound) in display_implied_bounds {
- let field = &variant.fields[field];
- if field.contains_generic {
- display_inferred_bounds.insert(field.ty, bound);
- }
- }
- let ident = &variant.ident;
- let pat = fields_pat(&variant.fields);
- quote! {
- #ty::#ident #pat => #display
- }
- });
- let arms = arms.collect::<Vec<_>>();
- let display_where_clause = display_inferred_bounds.augment_where_clause(input.generics);
- Some(quote! {
- #[allow(unused_qualifications)]
- impl #impl_generics ::core::fmt::Display for #ty #ty_generics #display_where_clause {
- fn fmt(&self, __formatter: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
- #use_as_display
- #[allow(unused_variables, deprecated, clippy::used_underscore_binding)]
- match #void_deref self {
- #(#arms,)*
- }
- }
- }
- })
- } else {
- None
- };
-
- let from_impls = input.variants.iter().filter_map(|variant| {
- let from_field = variant.from_field()?;
- let backtrace_field = variant.distinct_backtrace_field();
- let variant = &variant.ident;
- let from = unoptional_type(from_field.ty);
- let body = from_initializer(from_field, backtrace_field);
- Some(quote! {
- #[allow(unused_qualifications)]
- impl #impl_generics ::core::convert::From<#from> for #ty #ty_generics #where_clause {
- #[allow(deprecated)]
- fn from(source: #from) -> Self {
- #ty::#variant #body
- }
- }
- })
- });
-
- if input.generics.type_params().next().is_some() {
- let self_token = <Token![Self]>::default();
- error_inferred_bounds.insert(self_token, Trait::Debug);
- error_inferred_bounds.insert(self_token, Trait::Display);
- }
- let error_where_clause = error_inferred_bounds.augment_where_clause(input.generics);
-
- quote! {
- #[allow(unused_qualifications)]
- impl #impl_generics std::error::Error for #ty #ty_generics #error_where_clause {
- #source_method
- #provide_method
- }
- #display_impl
- #(#from_impls)*
- }
-}
-
-fn fields_pat(fields: &[Field]) -> TokenStream {
- let mut members = fields.iter().map(|field| &field.member).peekable();
- match members.peek() {
- Some(Member::Named(_)) => quote!({ #(#members),* }),
- Some(Member::Unnamed(_)) => {
- let vars = members.map(|member| match member {
- Member::Unnamed(member) => format_ident!("_{}", member),
- Member::Named(_) => unreachable!(),
- });
- quote!((#(#vars),*))
- }
- None => quote!({}),
- }
-}
-
-fn use_as_display(needs_as_display: bool) -> Option<TokenStream> {
- if needs_as_display {
- Some(quote! {
- use thiserror::__private::AsDisplay as _;
- })
- } else {
- None
- }
-}
-
-fn from_initializer(from_field: &Field, backtrace_field: Option<&Field>) -> TokenStream {
- let from_member = &from_field.member;
- let some_source = if type_is_option(from_field.ty) {
- quote!(::core::option::Option::Some(source))
- } else {
- quote!(source)
- };
- let backtrace = backtrace_field.map(|backtrace_field| {
- let backtrace_member = &backtrace_field.member;
- if type_is_option(backtrace_field.ty) {
- quote! {
- #backtrace_member: ::core::option::Option::Some(std::backtrace::Backtrace::capture()),
- }
- } else {
- quote! {
- #backtrace_member: ::core::convert::From::from(std::backtrace::Backtrace::capture()),
- }
- }
- });
- quote!({
- #from_member: #some_source,
- #backtrace
- })
-}
-
-fn type_is_option(ty: &Type) -> bool {
- type_parameter_of_option(ty).is_some()
-}
-
-fn unoptional_type(ty: &Type) -> TokenStream {
- let unoptional = type_parameter_of_option(ty).unwrap_or(ty);
- quote!(#unoptional)
-}
-
-fn type_parameter_of_option(ty: &Type) -> Option<&Type> {
- let path = match ty {
- Type::Path(ty) => &ty.path,
- _ => return None,
- };
-
- let last = path.segments.last().unwrap();
- if last.ident != "Option" {
- return None;
- }
-
- let bracketed = match &last.arguments {
- PathArguments::AngleBracketed(bracketed) => bracketed,
- _ => return None,
- };
-
- if bracketed.args.len() != 1 {
- return None;
- }
-
- match &bracketed.args[0] {
- GenericArgument::Type(arg) => Some(arg),
- _ => None,
- }
-}
diff --git a/vendor/thiserror-impl/src/fmt.rs b/vendor/thiserror-impl/src/fmt.rs
deleted file mode 100644
index 807dfb9..0000000
--- a/vendor/thiserror-impl/src/fmt.rs
+++ /dev/null
@@ -1,170 +0,0 @@
-use crate::ast::Field;
-use crate::attr::{Display, Trait};
-use proc_macro2::TokenTree;
-use quote::{format_ident, quote_spanned};
-use std::collections::{BTreeSet as Set, HashMap as Map};
-use syn::ext::IdentExt;
-use syn::parse::{ParseStream, Parser};
-use syn::{Ident, Index, LitStr, Member, Result, Token};
-
-impl Display<'_> {
- // Transform `"error {var}"` to `"error {}", var`.
- pub fn expand_shorthand(&mut self, fields: &[Field]) {
- let raw_args = self.args.clone();
- let mut named_args = explicit_named_args.parse2(raw_args).unwrap();
- let mut member_index = Map::new();
- for (i, field) in fields.iter().enumerate() {
- member_index.insert(&field.member, i);
- }
-
- let span = self.fmt.span();
- let fmt = self.fmt.value();
- let mut read = fmt.as_str();
- let mut out = String::new();
- let mut args = self.args.clone();
- let mut has_bonus_display = false;
- let mut implied_bounds = Set::new();
-
- let mut has_trailing_comma = false;
- if let Some(TokenTree::Punct(punct)) = args.clone().into_iter().last() {
- if punct.as_char() == ',' {
- has_trailing_comma = true;
- }
- }
-
- while let Some(brace) = read.find('{') {
- out += &read[..brace + 1];
- read = &read[brace + 1..];
- if read.starts_with('{') {
- out.push('{');
- read = &read[1..];
- continue;
- }
- let next = match read.chars().next() {
- Some(next) => next,
- None => return,
- };
- let member = match next {
- '0'..='9' => {
- let int = take_int(&mut read);
- let member = match int.parse::<u32>() {
- Ok(index) => Member::Unnamed(Index { index, span }),
- Err(_) => return,
- };
- if !member_index.contains_key(&member) {
- out += &int;
- continue;
- }
- member
- }
- 'a'..='z' | 'A'..='Z' | '_' => {
- let mut ident = take_ident(&mut read);
- ident.set_span(span);
- Member::Named(ident)
- }
- _ => continue,
- };
- if let Some(&field) = member_index.get(&member) {
- let end_spec = match read.find('}') {
- Some(end_spec) => end_spec,
- None => return,
- };
- let bound = match read[..end_spec].chars().next_back() {
- Some('?') => Trait::Debug,
- Some('o') => Trait::Octal,
- Some('x') => Trait::LowerHex,
- Some('X') => Trait::UpperHex,
- Some('p') => Trait::Pointer,
- Some('b') => Trait::Binary,
- Some('e') => Trait::LowerExp,
- Some('E') => Trait::UpperExp,
- Some(_) | None => Trait::Display,
- };
- implied_bounds.insert((field, bound));
- }
- let local = match &member {
- Member::Unnamed(index) => format_ident!("_{}", index),
- Member::Named(ident) => ident.clone(),
- };
- let mut formatvar = local.clone();
- if formatvar.to_string().starts_with("r#") {
- formatvar = format_ident!("r_{}", formatvar);
- }
- if formatvar.to_string().starts_with('_') {
- // Work around leading underscore being rejected by 1.40 and
- // older compilers. https://github.com/rust-lang/rust/pull/66847
- formatvar = format_ident!("field_{}", formatvar);
- }
- out += &formatvar.to_string();
- if !named_args.insert(formatvar.clone()) {
- // Already specified in the format argument list.
- continue;
- }
- if !has_trailing_comma {
- args.extend(quote_spanned!(span=> ,));
- }
- args.extend(quote_spanned!(span=> #formatvar = #local));
- if read.starts_with('}') && member_index.contains_key(&member) {
- has_bonus_display = true;
- args.extend(quote_spanned!(span=> .as_display()));
- }
- has_trailing_comma = false;
- }
-
- out += read;
- self.fmt = LitStr::new(&out, self.fmt.span());
- self.args = args;
- self.has_bonus_display = has_bonus_display;
- self.implied_bounds = implied_bounds;
- }
-}
-
-fn explicit_named_args(input: ParseStream) -> Result<Set<Ident>> {
- let mut named_args = Set::new();
-
- while !input.is_empty() {
- if input.peek(Token![,]) && input.peek2(Ident::peek_any) && input.peek3(Token![=]) {
- input.parse::<Token![,]>()?;
- let ident = input.call(Ident::parse_any)?;
- input.parse::<Token![=]>()?;
- named_args.insert(ident);
- } else {
- input.parse::<TokenTree>()?;
- }
- }
-
- Ok(named_args)
-}
-
-fn take_int(read: &mut &str) -> String {
- let mut int = String::new();
- for (i, ch) in read.char_indices() {
- match ch {
- '0'..='9' => int.push(ch),
- _ => {
- *read = &read[i..];
- break;
- }
- }
- }
- int
-}
-
-fn take_ident(read: &mut &str) -> Ident {
- let mut ident = String::new();
- let raw = read.starts_with("r#");
- if raw {
- ident.push_str("r#");
- *read = &read[2..];
- }
- for (i, ch) in read.char_indices() {
- match ch {
- 'a'..='z' | 'A'..='Z' | '0'..='9' | '_' => ident.push(ch),
- _ => {
- *read = &read[i..];
- break;
- }
- }
- }
- Ident::parse_any.parse_str(&ident).unwrap()
-}
diff --git a/vendor/thiserror-impl/src/generics.rs b/vendor/thiserror-impl/src/generics.rs
deleted file mode 100644
index 95592a7..0000000
--- a/vendor/thiserror-impl/src/generics.rs
+++ /dev/null
@@ -1,83 +0,0 @@
-use proc_macro2::TokenStream;
-use quote::ToTokens;
-use std::collections::btree_map::Entry;
-use std::collections::{BTreeMap as Map, BTreeSet as Set};
-use syn::punctuated::Punctuated;
-use syn::{parse_quote, GenericArgument, Generics, Ident, PathArguments, Token, Type, WhereClause};
-
-pub struct ParamsInScope<'a> {
- names: Set<&'a Ident>,
-}
-
-impl<'a> ParamsInScope<'a> {
- pub fn new(generics: &'a Generics) -> Self {
- ParamsInScope {
- names: generics.type_params().map(|param| &param.ident).collect(),
- }
- }
-
- pub fn intersects(&self, ty: &Type) -> bool {
- let mut found = false;
- crawl(self, ty, &mut found);
- found
- }
-}
-
-fn crawl(in_scope: &ParamsInScope, ty: &Type, found: &mut bool) {
- if let Type::Path(ty) = ty {
- if ty.qself.is_none() {
- if let Some(ident) = ty.path.get_ident() {
- if in_scope.names.contains(ident) {
- *found = true;
- }
- }
- }
- for segment in &ty.path.segments {
- if let PathArguments::AngleBracketed(arguments) = &segment.arguments {
- for arg in &arguments.args {
- if let GenericArgument::Type(ty) = arg {
- crawl(in_scope, ty, found);
- }
- }
- }
- }
- }
-}
-
-pub struct InferredBounds {
- bounds: Map<String, (Set<String>, Punctuated<TokenStream, Token![+]>)>,
- order: Vec<TokenStream>,
-}
-
-impl InferredBounds {
- pub fn new() -> Self {
- InferredBounds {
- bounds: Map::new(),
- order: Vec::new(),
- }
- }
-
- #[allow(clippy::type_repetition_in_bounds, clippy::trait_duplication_in_bounds)] // clippy bug: https://github.com/rust-lang/rust-clippy/issues/8771
- pub fn insert(&mut self, ty: impl ToTokens, bound: impl ToTokens) {
- let ty = ty.to_token_stream();
- let bound = bound.to_token_stream();
- let entry = self.bounds.entry(ty.to_string());
- if let Entry::Vacant(_) = entry {
- self.order.push(ty);
- }
- let (set, tokens) = entry.or_default();
- if set.insert(bound.to_string()) {
- tokens.push(bound);
- }
- }
-
- pub fn augment_where_clause(&self, generics: &Generics) -> WhereClause {
- let mut generics = generics.clone();
- let where_clause = generics.make_where_clause();
- for ty in &self.order {
- let (_set, bounds) = &self.bounds[&ty.to_string()];
- where_clause.predicates.push(parse_quote!(#ty: #bounds));
- }
- generics.where_clause.unwrap()
- }
-}
diff --git a/vendor/thiserror-impl/src/lib.rs b/vendor/thiserror-impl/src/lib.rs
deleted file mode 100644
index 58f4bb5..0000000
--- a/vendor/thiserror-impl/src/lib.rs
+++ /dev/null
@@ -1,36 +0,0 @@
-#![allow(
- clippy::blocks_in_conditions,
- clippy::cast_lossless,
- clippy::cast_possible_truncation,
- clippy::manual_find,
- clippy::manual_let_else,
- clippy::manual_map,
- clippy::map_unwrap_or,
- clippy::module_name_repetitions,
- clippy::needless_pass_by_value,
- clippy::range_plus_one,
- clippy::single_match_else,
- clippy::struct_field_names,
- clippy::too_many_lines,
- clippy::wrong_self_convention
-)]
-
-extern crate proc_macro;
-
-mod ast;
-mod attr;
-mod expand;
-mod fmt;
-mod generics;
-mod prop;
-mod span;
-mod valid;
-
-use proc_macro::TokenStream;
-use syn::{parse_macro_input, DeriveInput};
-
-#[proc_macro_derive(Error, attributes(backtrace, error, from, source))]
-pub fn derive_error(input: TokenStream) -> TokenStream {
- let input = parse_macro_input!(input as DeriveInput);
- expand::derive(&input).into()
-}
diff --git a/vendor/thiserror-impl/src/prop.rs b/vendor/thiserror-impl/src/prop.rs
deleted file mode 100644
index 2867cd3..0000000
--- a/vendor/thiserror-impl/src/prop.rs
+++ /dev/null
@@ -1,147 +0,0 @@
-use crate::ast::{Enum, Field, Struct, Variant};
-use crate::span::MemberSpan;
-use proc_macro2::Span;
-use syn::{Member, Type};
-
-impl Struct<'_> {
- pub(crate) fn from_field(&self) -> Option<&Field> {
- from_field(&self.fields)
- }
-
- pub(crate) fn source_field(&self) -> Option<&Field> {
- source_field(&self.fields)
- }
-
- pub(crate) fn backtrace_field(&self) -> Option<&Field> {
- backtrace_field(&self.fields)
- }
-
- pub(crate) fn distinct_backtrace_field(&self) -> Option<&Field> {
- let backtrace_field = self.backtrace_field()?;
- distinct_backtrace_field(backtrace_field, self.from_field())
- }
-}
-
-impl Enum<'_> {
- pub(crate) fn has_source(&self) -> bool {
- self.variants
- .iter()
- .any(|variant| variant.source_field().is_some() || variant.attrs.transparent.is_some())
- }
-
- pub(crate) fn has_backtrace(&self) -> bool {
- self.variants
- .iter()
- .any(|variant| variant.backtrace_field().is_some())
- }
-
- pub(crate) fn has_display(&self) -> bool {
- self.attrs.display.is_some()
- || self.attrs.transparent.is_some()
- || self
- .variants
- .iter()
- .any(|variant| variant.attrs.display.is_some())
- || self
- .variants
- .iter()
- .all(|variant| variant.attrs.transparent.is_some())
- }
-}
-
-impl Variant<'_> {
- pub(crate) fn from_field(&self) -> Option<&Field> {
- from_field(&self.fields)
- }
-
- pub(crate) fn source_field(&self) -> Option<&Field> {
- source_field(&self.fields)
- }
-
- pub(crate) fn backtrace_field(&self) -> Option<&Field> {
- backtrace_field(&self.fields)
- }
-
- pub(crate) fn distinct_backtrace_field(&self) -> Option<&Field> {
- let backtrace_field = self.backtrace_field()?;
- distinct_backtrace_field(backtrace_field, self.from_field())
- }
-}
-
-impl Field<'_> {
- pub(crate) fn is_backtrace(&self) -> bool {
- type_is_backtrace(self.ty)
- }
-
- pub(crate) fn source_span(&self) -> Span {
- if let Some(source_attr) = &self.attrs.source {
- source_attr.path().get_ident().unwrap().span()
- } else if let Some(from_attr) = &self.attrs.from {
- from_attr.path().get_ident().unwrap().span()
- } else {
- self.member.member_span()
- }
- }
-}
-
-fn from_field<'a, 'b>(fields: &'a [Field<'b>]) -> Option<&'a Field<'b>> {
- for field in fields {
- if field.attrs.from.is_some() {
- return Some(field);
- }
- }
- None
-}
-
-fn source_field<'a, 'b>(fields: &'a [Field<'b>]) -> Option<&'a Field<'b>> {
- for field in fields {
- if field.attrs.from.is_some() || field.attrs.source.is_some() {
- return Some(field);
- }
- }
- for field in fields {
- match &field.member {
- Member::Named(ident) if ident == "source" => return Some(field),
- _ => {}
- }
- }
- None
-}
-
-fn backtrace_field<'a, 'b>(fields: &'a [Field<'b>]) -> Option<&'a Field<'b>> {
- for field in fields {
- if field.attrs.backtrace.is_some() {
- return Some(field);
- }
- }
- for field in fields {
- if field.is_backtrace() {
- return Some(field);
- }
- }
- None
-}
-
-// The #[backtrace] field, if it is not the same as the #[from] field.
-fn distinct_backtrace_field<'a, 'b>(
- backtrace_field: &'a Field<'b>,
- from_field: Option<&Field>,
-) -> Option<&'a Field<'b>> {
- if from_field.map_or(false, |from_field| {
- from_field.member == backtrace_field.member
- }) {
- None
- } else {
- Some(backtrace_field)
- }
-}
-
-fn type_is_backtrace(ty: &Type) -> bool {
- let path = match ty {
- Type::Path(ty) => &ty.path,
- _ => return false,
- };
-
- let last = path.segments.last().unwrap();
- last.ident == "Backtrace" && last.arguments.is_empty()
-}
diff --git a/vendor/thiserror-impl/src/span.rs b/vendor/thiserror-impl/src/span.rs
deleted file mode 100644
index c1237dd..0000000
--- a/vendor/thiserror-impl/src/span.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-use proc_macro2::Span;
-use syn::Member;
-
-pub trait MemberSpan {
- fn member_span(&self) -> Span;
-}
-
-impl MemberSpan for Member {
- fn member_span(&self) -> Span {
- match self {
- Member::Named(ident) => ident.span(),
- Member::Unnamed(index) => index.span,
- }
- }
-}
diff --git a/vendor/thiserror-impl/src/valid.rs b/vendor/thiserror-impl/src/valid.rs
deleted file mode 100644
index cf5b859..0000000
--- a/vendor/thiserror-impl/src/valid.rs
+++ /dev/null
@@ -1,237 +0,0 @@
-use crate::ast::{Enum, Field, Input, Struct, Variant};
-use crate::attr::Attrs;
-use quote::ToTokens;
-use std::collections::BTreeSet as Set;
-use syn::{Error, GenericArgument, Member, PathArguments, Result, Type};
-
-impl Input<'_> {
- pub(crate) fn validate(&self) -> Result<()> {
- match self {
- Input::Struct(input) => input.validate(),
- Input::Enum(input) => input.validate(),
- }
- }
-}
-
-impl Struct<'_> {
- fn validate(&self) -> Result<()> {
- check_non_field_attrs(&self.attrs)?;
- if let Some(transparent) = self.attrs.transparent {
- if self.fields.len() != 1 {
- return Err(Error::new_spanned(
- transparent.original,
- "#[error(transparent)] requires exactly one field",
- ));
- }
- if let Some(source) = self.fields.iter().find_map(|f| f.attrs.source) {
- return Err(Error::new_spanned(
- source,
- "transparent error struct can't contain #[source]",
- ));
- }
- }
- check_field_attrs(&self.fields)?;
- for field in &self.fields {
- field.validate()?;
- }
- Ok(())
- }
-}
-
-impl Enum<'_> {
- fn validate(&self) -> Result<()> {
- check_non_field_attrs(&self.attrs)?;
- let has_display = self.has_display();
- for variant in &self.variants {
- variant.validate()?;
- if has_display && variant.attrs.display.is_none() && variant.attrs.transparent.is_none()
- {
- return Err(Error::new_spanned(
- variant.original,
- "missing #[error(\"...\")] display attribute",
- ));
- }
- }
- let mut from_types = Set::new();
- for variant in &self.variants {
- if let Some(from_field) = variant.from_field() {
- let repr = from_field.ty.to_token_stream().to_string();
- if !from_types.insert(repr) {
- return Err(Error::new_spanned(
- from_field.original,
- "cannot derive From because another variant has the same source type",
- ));
- }
- }
- }
- Ok(())
- }
-}
-
-impl Variant<'_> {
- fn validate(&self) -> Result<()> {
- check_non_field_attrs(&self.attrs)?;
- if self.attrs.transparent.is_some() {
- if self.fields.len() != 1 {
- return Err(Error::new_spanned(
- self.original,
- "#[error(transparent)] requires exactly one field",
- ));
- }
- if let Some(source) = self.fields.iter().find_map(|f| f.attrs.source) {
- return Err(Error::new_spanned(
- source,
- "transparent variant can't contain #[source]",
- ));
- }
- }
- check_field_attrs(&self.fields)?;
- for field in &self.fields {
- field.validate()?;
- }
- Ok(())
- }
-}
-
-impl Field<'_> {
- fn validate(&self) -> Result<()> {
- if let Some(display) = &self.attrs.display {
- return Err(Error::new_spanned(
- display.original,
- "not expected here; the #[error(...)] attribute belongs on top of a struct or an enum variant",
- ));
- }
- Ok(())
- }
-}
-
-fn check_non_field_attrs(attrs: &Attrs) -> Result<()> {
- if let Some(from) = &attrs.from {
- return Err(Error::new_spanned(
- from,
- "not expected here; the #[from] attribute belongs on a specific field",
- ));
- }
- if let Some(source) = &attrs.source {
- return Err(Error::new_spanned(
- source,
- "not expected here; the #[source] attribute belongs on a specific field",
- ));
- }
- if let Some(backtrace) = &attrs.backtrace {
- return Err(Error::new_spanned(
- backtrace,
- "not expected here; the #[backtrace] attribute belongs on a specific field",
- ));
- }
- if let Some(display) = &attrs.display {
- if attrs.transparent.is_some() {
- return Err(Error::new_spanned(
- display.original,
- "cannot have both #[error(transparent)] and a display attribute",
- ));
- }
- }
- Ok(())
-}
-
-fn check_field_attrs(fields: &[Field]) -> Result<()> {
- let mut from_field = None;
- let mut source_field = None;
- let mut backtrace_field = None;
- let mut has_backtrace = false;
- for field in fields {
- if let Some(from) = field.attrs.from {
- if from_field.is_some() {
- return Err(Error::new_spanned(from, "duplicate #[from] attribute"));
- }
- from_field = Some(field);
- }
- if let Some(source) = field.attrs.source {
- if source_field.is_some() {
- return Err(Error::new_spanned(source, "duplicate #[source] attribute"));
- }
- source_field = Some(field);
- }
- if let Some(backtrace) = field.attrs.backtrace {
- if backtrace_field.is_some() {
- return Err(Error::new_spanned(
- backtrace,
- "duplicate #[backtrace] attribute",
- ));
- }
- backtrace_field = Some(field);
- has_backtrace = true;
- }
- if let Some(transparent) = field.attrs.transparent {
- return Err(Error::new_spanned(
- transparent.original,
- "#[error(transparent)] needs to go outside the enum or struct, not on an individual field",
- ));
- }
- has_backtrace |= field.is_backtrace();
- }
- if let (Some(from_field), Some(source_field)) = (from_field, source_field) {
- if !same_member(from_field, source_field) {
- return Err(Error::new_spanned(
- from_field.attrs.from,
- "#[from] is only supported on the source field, not any other field",
- ));
- }
- }
- if let Some(from_field) = from_field {
- let max_expected_fields = match backtrace_field {
- Some(backtrace_field) => 1 + !same_member(from_field, backtrace_field) as usize,
- None => 1 + has_backtrace as usize,
- };
- if fields.len() > max_expected_fields {
- return Err(Error::new_spanned(
- from_field.attrs.from,
- "deriving From requires no fields other than source and backtrace",
- ));
- }
- }
- if let Some(source_field) = source_field.or(from_field) {
- if contains_non_static_lifetime(source_field.ty) {
- return Err(Error::new_spanned(
- &source_field.original.ty,
- "non-static lifetimes are not allowed in the source of an error, because std::error::Error requires the source is dyn Error + 'static",
- ));
- }
- }
- Ok(())
-}
-
-fn same_member(one: &Field, two: &Field) -> bool {
- match (&one.member, &two.member) {
- (Member::Named(one), Member::Named(two)) => one == two,
- (Member::Unnamed(one), Member::Unnamed(two)) => one.index == two.index,
- _ => unreachable!(),
- }
-}
-
-fn contains_non_static_lifetime(ty: &Type) -> bool {
- match ty {
- Type::Path(ty) => {
- let bracketed = match &ty.path.segments.last().unwrap().arguments {
- PathArguments::AngleBracketed(bracketed) => bracketed,
- _ => return false,
- };
- for arg in &bracketed.args {
- match arg {
- GenericArgument::Type(ty) if contains_non_static_lifetime(ty) => return true,
- GenericArgument::Lifetime(lifetime) if lifetime.ident != "static" => {
- return true
- }
- _ => {}
- }
- }
- false
- }
- Type::Reference(ty) => ty
- .lifetime
- .as_ref()
- .map_or(false, |lifetime| lifetime.ident != "static"),
- _ => false, // maybe implement later if there are common other cases
- }
-}
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