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Update Rust crate syn to v2 - autoclosed #26

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Update Rust crate syn to v2 - autoclosed #26

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This PR contains the following updates:

Package Type Update Change
syn dependencies major 1.0 -> 2.0

Release Notes

dtolnay/syn (syn)

v2.0.38

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  • Fix "method 'peek' has an incompatible type for trait" error when defining bool as a custom keyword (#​1518, thanks @​Vanille-N)

v2.0.37

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  • Work around incorrect future compatibility warning in rustc 1.74.0-nightly

v2.0.36

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  • Restore compatibility with --generate-link-to-definition documentation builds (#​1514)

v2.0.35

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  • Make rust-analyzer produce preferred brackets for invocations of Token! macro (#​1510, #​1512)

v2.0.34

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  • Documentation improvements

v2.0.33

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  • Special handling for the (/*ERROR*/) placeholder that rustc uses for macros that fail to expand

v2.0.32

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v2.0.31

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v2.0.30

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v2.0.29

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v2.0.28

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  • Fix inconsistency between full and non-full expression parse errors (#​1491)

v2.0.27

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v2.0.26

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  • Implement Spanned for QSelf (#​1465)

v2.0.25

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  • Support single identifier as unbraced const generic argument (#​1483)
  • Produce error message when LitStr::parse is used on a suffixed string literal (#​1484)

v2.0.24

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  • Fix duplication of braces around const generic argument in non-full mode (#​1482)

v2.0.23

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  • Preserve attributes on verbatim Item in statement position (#​1476)
  • Support generic_const_exprs where-clauses such as where [(); { T::COUNT }]: in non-"full" mode (#​1478)

v2.0.22

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v2.0.21

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  • Fix value computed by LitByteStr::value in the case of a cooked byte string literal containing form feed or vertical tab characters following an escaped newline (#​1474)

v2.0.20

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  • Documentation improvements

v2.0.19

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v2.0.18

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  • Permit empty attr in syn::meta::parser (#​1460)

v2.0.17

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  • Enable proc_macro support on wasm targets (#​1459)

v2.0.16

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v2.0.15

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  • Ensure Type::Tuple of length 1 prints as a tuple even if trailing comma is not provided in the Punctuated (#​1444, thanks @​Fancyflame)

v2.0.14

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v2.0.13

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v2.0.12

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  • Refer to compile_error! by absolute path in token stream produced by syn::Error::to_compile_error (#​1431, thanks @​smoelius)

v2.0.11

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  • Improve error message on empty parens inside parse_nested_meta (#​1428)

v2.0.10

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  • Fix visibility being parsed incorrectly on macro invocations inside of a trait

v2.0.9

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  • Disallow type items in an extern block, trait, or module from being marked default

v2.0.8

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  • Treat try keyword as 2015-edition identifier in definition of try macro (#​1422)

v2.0.7

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  • Fix parsing of mut self inside of Type::BareFn

v2.0.6

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  • Improve error message on missing ';' between statements (#​1419)
  • Keep non-brace macro invocations in trailing expr position as Expr::Macro (#​1420)

v2.0.5

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  • Expose ExprMacro data structure even when features="full" is not used (#​1417)

v2.0.4

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  • Improve error reporting when parsing identifiers and paths (#​1415, #​1416)

v2.0.3

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  • Expose ExprGroup data structure even when features="full" is not used (#​1412)

v2.0.2

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  • Documentation improvements

v2.0.1

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  • Add methods on syn::Meta for reporting error on an incorrect kind of attribute (#​1409)

v2.0.0

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This release contains a batch of syntax tree improvements to incorporate ongoing Rust language development from the past 3.5 years since syn 1.

It never seems like an ideal time to finalize a syntax tree design, considering the frankly alarming number of syntax-disrupting language features currently in flight: keyword generics, restrictions, capabilities and contexts, conditional constness, new varieties of literals, dyn revamp such as explicitly dyn-safe traits and dyn-star, expression syntax in various phases of being added or being torn out (const blocks, try blocks, raw references), auto traits and negative impls, generalizations to higher rank trait bounds, async closures and static async trait methods, postfix keywords, pattern types, return type notation, unsafe attributes, …

The plan continues to be the same as laid out originally in the 1.0.0 release announcement:

Be aware that the underlying Rust language will continue to evolve. Syn is able to accommodate most kinds of Rust grammar changes via the nonexhaustive enums and Verbatim variants in the syntax tree, but we will plan to put out new major versions on a 12 to 24 month cadence to incorporate ongoing language changes as needed.

If anything, the takeaway from the 3.5 year longevity of syn 1 is that this period was tamer from a language development perspective than anticipated, but that is unlikely to last and I think around 24 months is still the correct cadence to expect between releases going forward.


[API documentation for 2.0]

Breaking changes

  • Minimum required Rust version is raised from rustc 1.31 to 1.56.
Expressions

  • Support for box expr syntax has been deleted, as it has been deleted recently from rustc.

  • Support for type ascription syntax expr: Type in expression position has been deleted.

  • Support for unstable &raw const expr raw-pointer reference syntax has been deleted.

  • The representation of generic arguments has been unified between method calls and non-method paths into a single GenericArgument type, which supersedes the previous GenericMethodArgument and MethodTurbofish.

  • Generic arguments now distinguish between associated types (AssocType) and associated constant values (AssocConst). Previously these would be parsed ambiguously as Binding.

  • The binary assignment operators in BinOp have been renamed to align with the naming used by the standard library's core::ops module's traits. For example BinOp::AddEq is now called BinOp::AddAssign.

  • Expr::Struct struct construction expressions now support structs which are a variant of an enum associated type of a trait, as in <Type as Trait>::Assoc::Variant { ... }, which has recently been added to Rust.

  • Expr::Range now follows the start and end naming used by the standard library's RangeBounds trait, rather than from/to or lo/hi.

  • Expr::AssignOp has been merged into Expr::Binary, which now represents both non-assignment and assignment binary operators.

  • Stricter parsing of ranges. None of the following are valid expressions, but were previously accepted by syn: ..=, lo..=, ..., ...hi, lo..., lo...hi.

  • Expr::Closure now includes a representation for for<...> lifetimes.

Statements

  • Variants Stmt::Expr (tail-position expression without trailing semicolon) and Stmt::Semi (non-tail expression with trailing semicolon) have been combined into Stmt::Expr with the optional semicolon represented by Option<Token![;]>.

  • The syntax tree for Stmt::Local has been extended to handle let/else syntax.

  • Macros in statement position are now uniformly parsed as Stmt::Macro. Previously these would be disambiguated to Stmt::Item, although it was ambiguous whether a macro in statement position would expand to an item (like thread_local! { ... }) vs an expression (like println! { ... }).

Patterns

  • Pattern parsing for all the different syntactic positions in which patterns are allowed has been split into Pat::parse_single (for function- and closure-argument position, where top-level | is not allowed), Pat::parse_multi (where | is allowed) and Pat::parse_multi_with_leading_vert (for the pattern of match arms, which allow an optional leading |). Previously only a single parse behavior was supported and behaved like the new parse_single.

  • The Pat syntax tree now shares more common data structures with the Expr syntax tree where possible, such as for literals, paths, macros, and ranges in pattern position.

  • Parsing of struct field patterns does a better job rejecting bogus syntax such as Struct { 0 asdf } and Struct { ref mut 0: asdf }, which were previously incorrectly accepted.

  • Pat::Range now supports one-sided ranges by representing the start and end bound of the range by Option<Expr>.

  • Pat::Struct keeps track of attributes on the optional .. "rest" part of the pattern, as in let Struct { x, #[cfg(any())] .. } = _;.

  • Parsing unary negation now enforces that only literal patterns can be unarily negated. For example -self::CONST and -const { 0i32 } are not valid syntax in pattern position.

  • Pat::TupleStruct no longer wraps a value of type PatTuple but represents that information in its fields directly.

  • A single parenthesized pattern without trailing comma inside the parentheses is no longer considered a Pat::Tuple, it will be parsed as Pat::Paren.

  • One-sided range patterns are no longer allowed inside of slice patterns. [lo..] and [..=hi] are not considered valid pattern syntax by Rust.

Items

  • Typed self in a method signature, such as self: Pin<&mut Self>, will now be parsed as FnArg::Receiver. This means self, whether with or without an explicit type, is always treated as a Receiver. Previously only the &self and &mut self shorthand receivers were parsed as Receiver.

  • TraitItem::Method and ImplItem::Method have been renamed to TraitItem::Fn and ImplItem::Fn, as they do not necessarily represent methods if the function signature contains no self.

  • Item::Macro2 has been deleted as "macros 2.0" syntax is no longer considered on track for stabilization.

  • Various item kinds now hold Generics which didn't used to have them.

  • The variadic argument of an extern function signature can now be given an optional parameter name.

  • WherePredicate::Eq is no longer supported.

  • Visibility::Crate is no longer supported. This syntax has been removed from rustc.

  • Public visibility is now represented by a single Token![pub] token rather than the old VisPublic struct.

  • LifetimeDef is now called LifetimeParam. This name makes more sense in the context of the GenericParam enum (which also includes TypeParam and ConstParam), and is the name that the Rust Reference uses.

  • Modules and extern blocks (Item::Mod and Item::ForeignMod) can now be marked unsafe.

Attributes

  • The syntax tree for Attribute has been redesigned. The new API better accommodates attributes which mix structured and unstructured content at different levels of nesting.

  • AttributeArgs has been removed. Use Punctuated<Meta, Token![,]>.

  • For parsing attribute contents, parse_meta() is superseded by a new parsing library called syn::meta, and the parse_nested_meta method on Attribute.

Tokens

  • In string literals, the handling of non-ASCII whitespace after trailing \ now matches what is implemented by rustc. Space, horizontal tab, line feed, and carriage return are the only 4 whitespace characters which are supposed to be stripped from the beginning of the next line.

  • The delimiter tokens syn::token::Paren, Bracket, and Brace now store 2 spans (the open and close punctuation separately) rather than just 1. Use .join() to obtain a single Span spanning the whole group.

  • Keyword construction now requires a single span; an array of 1 span is no longer accepted. Use Token![trait](span) instead of Token![trait]([span]).

  • Some token types have been renamed to conform with terminology used by the Rust Reference. These are Add->Plus, Bang->Not, Colon2->PathSep, Div->Slash, Dot2->DotDot, Dot3->DotDotDot, Rem->Percent, and Sub->Minus.

More

  • Several enums have been made #[non_exhaustive] in anticipation of upcoming language changes. This includes WherePredicate, Lit, and GenericArgument.

  • The impl Extend<Pair<T, P>> for Punctuated<T, P> now requires P: Default and will push a default punctuation between the pre-existing elements and the new ones, if there is not already a trailing punctuation. Previously it would panic in this situation.

  • ParseStream::parse_terminated now takes a peek-style punctuation argument instead of turbofish. Replace input.parse_terminated::<_, Token![,]>(Thing::parse) with input.parse_terminated(Thing::parse, Token![,]).

v1.0.109

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v1.0.108

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  • Fix handling of unusual whitespace after escaped newlines in LitStr::value (#​1381, thanks @​ModProg)

v1.0.107

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  • Opt out of -Zrustdoc-scrape-examples on docs.rs for now

v1.0.106

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  • Documentation improvements

v1.0.105

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  • Improve parse errors related to dyn and impl type syntax (#​1245)

v1.0.104

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  • Add PathArguments::is_none()

v1.0.103

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v1.0.102

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  • More efficient internal representation for TokenBuffer (#​1223, thanks @​CAD97)
  • Fix parsing of a left shift after macro metavariable in type position (#​1229)

v1.0.101

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  • Eliminate a bunch of redundant work done by LitStr::parse (#​1221)

v1.0.100

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v1.0.99

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  • Add categories and keywords to crates.io metadata

v1.0.98

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  • Format example code with rustfmt

v1.0.97

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  • Update examples

v1.0.96

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  • Add a punct_mut() method on syn::punctuated::Pair to return Option<&mut P> (#​1183)

v1.0.95

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v1.0.94

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  • Resolve some unused_macro_rules warnings

v1.0.93

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  • Fix compile error when Some means something unusual in the expression namespace of the scope where custom_keyword is invoked (#​1171, thanks @​zakarumych)

v1.0.92

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v1.0.91

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  • impl ToTokens for RangeLimits
  • impl Parse for ExprAwait
  • impl Parse for GenericMethodArgument
  • impl Parse for MethodTurbofish

v1.0.90

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  • Update recommended exhaustive matching idiom to use non_exhaustive_omitted_patterns lint:

    match expr {
    Expr::Array(e) => {…}
    Expr::Assign(e) => {…}
    ...
    Expr::Yield(e) => {…}

    #[cfg_attr(test, deny(non_exhaustive_omitted_patterns))]
    _ => {/* some sane fallback */}
}

v1.0.89

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v1.0.88

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  • Parse .. pattern in pattern of let (#​1136)
  • Parse for<…> lifetime introducer on closures (#​1135)
  • Reject postfix operators after cast (#​1117)
  • Implement extra-traits for Nothing (#​1144)

v1.0.87

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v1.0.86

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  • Add support for parsing if- and while-let-chains (RFC 2497)

v1.0.85

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  • Add token() method to each variant of syn::Lit to expose the underlying token representation with original formatting

v1.0.84

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v1.0.83

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  • Fix panic parsing trait impl with qself in trait type: impl <Thing<>>::Trait for Type {} (#​1109)
  • Preserve attributes on let-else stmt: #[attr] let pat = val else { return } (#​1110)

v1.0.82

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  • Support parenthesized generic argument syntax with :: disambiguator: Fn::() -> ! (#​1096)

v1.0.81

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  • Support arbitrary precision negative literal tokens on rustc 1.56+ (#​1087, #​1088)

v1.0.80

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v1.0.79

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v1.0.78

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  • Parse trailing + in the bounds of impl Trait type (#​1073)

v1.0.77

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  • Match Rust 1.57+'s parsing of dot and question mark after a curly braced macro invocation (#​1068)

v1.0.76

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  • Parse unstable let–else syntax (#​1050, #​1057)
  • Parse qualified braced variant expressions and patterns: <E>::V {..} (#​1058, #​1059)
  • Fix precedence of outer attributes in front of an assignment expression in statement position (#​1060)

v1.0.75

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  • Improve spans on a method without body inside an impl block
  • Documentation improvements (#​922, thanks @​Tamschi)

v1.0.74

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  • Reject for<'a> dyn Trait<'a> syntax; the correct representation is dyn for<'a> Trait<'a> (#​1042)

v1.0.73

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v1.0.72

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  • Parse const generics which use value of a previous const generic parameter as a default value (#​1027)

v1.0.71

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  • Fix panic deserializing an ItemImpl with a non-path in trait position (#​1023)
  • Parse visibility on impl blocks (#​1024)
  • Fix parsing a type parameter default on the first generic parameter of an impl block (#​1025, thanks @​taiki-e)

v1.0.70

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  • Fix precedence of closure body vs ExprRange rhs: || .. .method() (#​1019)
  • Parse inner attributes inside of structs and enums (#​1022)

v1.0.69

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v1.0.68

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  • Preserve span of LexError on conversion to syn::Error (#​1006)

v1.0.67

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  • Accept outer attributes in the Parse impl of ExprBlock (#​1004)

v1.0.66

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  • Parse equality constraints on generic associated types (#​979)
  • Parse default value exprs in const generic declarations (#​980)
  • Fix infinite loop parsing malformed type ascription expression in non-full mode (#​978)
  • Improve Parse impls of ExprArray, ExprAsync, ExprBlock, ExprMacro, ExprParen, ExprRepeat, ExprStruct, ExprTryBlock, ExprUnsafe to succeed parsing even in the presence of trailing binary operators (#​991, #​992, #​993, #​994, #​995, #​996, #​997, #​998, #​999)

v1.0.65

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v1.0.64

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  • Avoid clippy::expl_impl_clone_on_copy pedantic lint in downstream custom token types (#​976)

v1.0.63

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  • Fix parsing associated types with empty trait bound list after colon (#​974)

v1.0.62

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v1.0.61

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  • Improve assertion failures on invalid use of Punctuated API (#​970, thanks @​osa1)
  • Add Lifetime::span and Lifetime::set_span accessors (#​971)

v1.0.60

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  • Provide an idiom for testing exhaustiveness of pattern matches on Expr, Type, Pat, Item, ForeignItem, TraitItem, and ImplItem (#​694)

    match expr {
    Expr::Array(e) => {...}
    Expr::Assign(e) => {...}
    ...
    Expr::Yield(e) => {...}

    #[cfg(test)]
    Expr::__TestExhaustive(_) => unimplemented!(),
    #[cfg(not(test))]
    _ => { /* some sane fallback */ }
}

    The above is the only supported idiom for exhaustive matching of those enum. Do not write anything differently as it is not supported.

    The conditional compilation on match-arms lets us fail your tests but not break your library when adding a variant. You will be notified by a test failure when a variant is added, so that you can add code to handle it, but your library will continue to compile and work for downstream users in the interim.

v1.0.59

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  • Parse empty supertrait lists consistently with rustc (#​952)
  • Fix loss of span information on comma tokens inside of Type::Tuple during parse (#​959)

v1.0.58

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  • Allow literals to parse as a const generic path argument even without "full" feature enabled (#​951)

    pub struct Struct {
    array: Array<10>,  // used to require `features = "full"`
}

v1.0.57

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  • Make Punctuated::new available as a const fn (#​949)

v1.0.56

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v1.0.55

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  • Preserve None-delimited group around macro metavariable when parsing T<$ty> (#​944, #​945)

v1.0.54

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  • Fix parsing of impl items with macro metavariable in the trait path: impl $trait for Type {...} (#​942)

v1.0.53

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  • Parse impl !Trait {...} syntax (#​936)

v1.0.52

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  • Parse unsafe extern block syntax (#​918)
  • Parse unsafe mod syntax (#​919)
  • Parse const {...} block syntax (#​921)
  • Parse destructuring assignment syntax (#​933)

v1.0.51

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  • Allow parsing signatures in which const generic params appear in front of lifetime params (#​920)

v1.0.50

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  • Apply doc(cfg(...)) on feature gated APIs for docs.rs-rendered documentation (#​925)

v1.0.48

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v1.0.47

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  • Documentation improvements

v1.0.46

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  • Fix parsing structured attributes that contain nested absolute paths, such as #[derive(::serde::Serialize)] (#​909)

v1.0.45

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  • Provide more detailed error messages when parsing specific literal kind (#​908)

v1.0.44

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  • Fix some parsing of patterns inside of None-delimited groups (#​907)

v1.0.43

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  • Add Parse impl for syn::Signature

v1.0.42

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  • Fix several bugs involving unusual suffixes on integer and floating point literal tokens (#​898, #​899, #​900)

v1.0.41

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  • Fix panic on printing an incomplete (having fewer path segments than originally parsed with) qualified path (ExprPath, PatPath, TypePath containing QSelf) (#​891, thanks @​taiki-e)
  • Fix panic triggered by syntactically invalid overflowing negative float literal after . in a field access position, e.g. let _ = obj.-0.9E999999 (#​895, thanks @​sameer)
  • Enable using parse_macro_input! with a Parser function rather than type having a Parse impl (#​896, thanks @​sbrocket)

v1.0.40

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  • Fix panic on parsing float literals having both an exponent and a suffix beginning with 'e' or 'E', such as 9e99e999 (#​893)

v1.0.39

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  • Improve compile time by pre-expanding derives (#​885)
  • Parse const generic parameters in any order relative to type parameters (#​886)

v1.0.38

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v1.0.37

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v1.0.36

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  • Add Lit::span, Lit::set_span (#​874)

v1.0.35

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  • Fix parsing of Expr::Field in non-full mode (#​870)

v1.0.34

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  • Documentation improvements

v1.0.33

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v1.0.32

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  • Fix parsing $:item macro_rules metavariables containing outer attributes (#​852)

v1.0.31

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  • Add Expr::parse_without_eager_brace to parse expressions in ambiguous syntactic position.

    Rust grammar has an ambiguity where braces sometimes turn a path expression into a struct initialization and sometimes do not. In the following code, the expression S {} is one expression. Presumably there is an empty struct struct S {} defined somewhere which it is instantiating.

    let _ = *S {};

// parsed by rustc as: `*(S {})`

    We would want to parse the above using Expr::parse after the = token.

    But in the following, S {} is not a struct init expression.

    if *S {} {}

// parsed by rustc as:
//
//    if (*S) {
//        /* empty block */
//    }
//    {
//        /* another empty block */
//    }

    For that reason we would want to parse if-conditions using Expr::parse_without_eager_brace after the if token. Same for similar syntactic positions such as the condition expr after a while token or the expr at the top of a match.

    The Rust grammar's choices around which way this ambiguity is resolved at various syntactic positions is fairly arbitrary. Really either parse behavior could work in most positions, and language designers just decide each case based on which is more likely to be what the programmer had in mind most of the time.

    if return S {} {}

// parsed by rustc as:
//
//    if (return (S {})) {
//    }
//
// but could equally well have been this other arbitrary choice:
//
//    if (return S) {
//    }
//    {}

    Note the grammar ambiguity on trailing braces is distinct from precedence and is not captured by assigning a precedence level to the braced struct init expr in relation to other operators. This can be illustrated by return 0..S {} vs match 0..S {}. The former parses as return (0..(S {})) implying tighter precedence for struct init than .., while the latter parses as match (0..S) {} implying tighter precedence for .. than struct init, a contradiction.

v1.0.30

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  • Parse struct init expressions where the type name is an interpolated macro_rules metavariable, such as $struct {} where $struct:ident (#​842)
  • Handle nesting of None-delimited groups (#​843, thanks @​Aaron1011)

v1.0.29

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  • Parse macro call exprs where the macro name is an interpolated macro_rules metavariable, such as $macro!() (#​838)
  • Parse paths containing generic parameters where the first path segment is an interpolated macro_rules metavariable, such as $seg<'a> (#​839)

v1.0.28

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  • Recognize empty None-delimited group produced by interpolating a $:vis macro metavariable when parsing a Visibility (#​836)

v1.0.27

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  • Parse function calls in which the callee is an interpolated macro variable $fn(...) (#​833)

v1.0.26

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v1.0.25

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v1.0.24

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  • Parse mut self receiver in function pointer type (#​812, #​814)
  • Parse const trait impls (#​813)
  • Improve error reporting inside struct expressions and struct patterns (#​818)

v1.0.23

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  • Parse inner attributes in traits (#​803)
  • Parse const underscore in traits and impls (#​804)
  • Implement Extend for Error (#​805)
  • Parse Or patterns (#​806)
  • Parse outer attributes on Expr* structs (#​807)
  • Parse top level const/static without value (#​808)
  • Parse syntactically accepted functions (#​809)
  • Parse extern static with value (#​810)

Thanks @​taiki-e for all of these.

v1.0.22

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  • Parse literal suffix on byte string, byte, and char literal tokens: br#"..."#suffix, b'?'suffix, '?'suffix (#​799, #​800)

v1.0.21

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  • Documentation improvements

v1.0.20

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  • Improve span of error message when an error during syn::Macro::parse_body is triggered past the last token of the macro body (#​791)

v1.0.19

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  • Parse a more lenient extern type syntax inside extern blocks (#​763)

v1.0.18

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  • Ignore unparsed empty None-delimited groups at the end of a macro input (#​783)

v1.0.17

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  • Expose syn::Lit in `default-features

Configuration

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This PR has been generated by Renovate Bot.

@oxide-renovate oxide-renovate bot added the dependencies Pull requests that update a dependency file label Oct 13, 2023
@oxide-renovate oxide-renovate bot changed the title Update Rust crate syn to v2 Update Rust crate syn to v2 - autoclosed Oct 13, 2023
@oxide-renovate oxide-renovate bot closed this Oct 13, 2023
@oxide-renovate oxide-renovate bot deleted the renovate/syn-2.x branch October 13, 2023 14:50
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