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Various changes to existing diagnostics * [Add code to `invalid ABI` error, add span label, move list to help to make message shorter](https://github.com/rust-lang/rust/pull/51463/commits/23ae5af274defa9ff884f593e44a2bbcaf814a02): ``` error[E0697]: invalid ABI: found `路濫狼á́́` --> $DIR/unicode.rs:11:8 | LL | extern "路濫狼á́́" fn foo() {} //~ ERROR invalid ABI | ^^^^^^^^^ invalid ABI | = help: valid ABIs: cdecl, stdcall, fastcall, vectorcall, thiscall, aapcs, win64, sysv64, ptx-kernel, msp430-interrupt, x86-interrupt, Rust, C, system, rust-intrinsic, rust-call, platform-intrinsic, unadjusted ``` * [Add code to incorrect `pub` restriction error](https://github.com/rust-lang/rust/pull/51463/commits/e96fdea8a38f39f99f8b9a4000a689187a457e08) * [Add message to `rustc_on_unimplemented` attributes in core to have them set a custom message _and_ label](https://github.com/rust-lang/rust/pull/51463/commits/2cc7e5ed307aee936c20479cfdc7409d6b52a464): ``` error[E0277]: `W` does not have a constant size known at compile-time --> $DIR/unsized-enum2.rs:33:8 | LL | VA(W), | ^ `W` does not have a constant size known at compile-time | = help: the trait `std::marker::Sized` is not implemented for `W` = help: consider adding a `where W: std::marker::Sized` bound = note: no field of an enum variant may have a dynamically sized type ``` ``` error[E0277]: `Foo` cannot be sent between threads safely --> $DIR/E0277-2.rs:26:5 | LL | is_send::<Foo>(); | ^^^^^^^^^^^^^^ `Foo` cannot be sent between threads safely | = help: the trait `std::marker::Send` is not implemented for `Foo` ``` ``` error[E0277]: can't compare `{integer}` with `std::string::String` --> $DIR/binops.rs:16:7 | LL | 5 < String::new(); | ^ no implementation for `{integer} < std::string::String` and `{integer} > std::string::String` | = help: the trait `std::cmp::PartialOrd<std::string::String>` is not implemented for `{integer}` ``` ``` error[E0277]: can't compare `{integer}` with `std::result::Result<{integer}, _>` --> $DIR/binops.rs:17:7 | LL | 6 == Ok(1); | ^^ no implementation for `{integer} == std::result::Result<{integer}, _>` | = help: the trait `std::cmp::PartialEq<std::result::Result<{integer}, _>>` is not implemented for `{integer}` ``` ``` error[E0277]: a collection of type `i32` cannot be built from an iterator over elements of type `i32` --> $DIR/type-check-defaults.rs:16:19 | LL | struct WellFormed<Z = Foo<i32, i32>>(Z); | ^ a collection of type `i32` cannot be built from `std::iter::Iterator<Item=i32>` | = help: the trait `std::iter::FromIterator<i32>` is not implemented for `i32` note: required by `Foo` --> $DIR/type-check-defaults.rs:15:1 | LL | struct Foo<T, U: FromIterator<T>>(T, U); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ``` * [Add link to book for `Sized` errors](https://github.com/rust-lang/rust/pull/51463/commits/1244dc7c283323aea1a3457a4458d590a3e160c8): ``` error[E0277]: `std::fmt::Debug + std::marker::Sync + 'static` does not have a constant size known at compile-time --> $DIR/const-unsized.rs:13:29 | LL | const CONST_0: Debug+Sync = *(&0 as &(Debug+Sync)); | ^^^^^^^^^^^^^^^^^^^^^^ `std::fmt::Debug + std::marker::Sync + 'static` does not have a constant size known at compile-time | = help: the trait `std::marker::Sized` is not implemented for `std::fmt::Debug + std::marker::Sync + 'static` = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized> = note: constant expressions must have a statically known size ``` * [Point to previous line for single expected token not found](https://github.com/rust-lang/rust/pull/51463/commits/48165168fb0f059d8536cd4a2276b609d4a7f721) (if the current token is in a different line)
The syntax crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), parser, pretty-printer,
lexer, macro expander, and utilities for traversing ASTs.
For more information about how these things work in rustc, see the rustc guide: