rust/compiler/rustc_parse/src/parser, branch 1.63.0

Rollup merge of #98183 - dtolnay:emptybound, r=lcnr

2022-06-20T07:41:46+00:00

Fix pretty printing of empty bound lists in where-clause Repro: ```rust macro_rules! assert_item_stringify { ($item:item $expected:literal) => { assert_eq!(stringify!($item), $expected); }; } fn main() { assert_item_stringify! { fn f<'a, T>() where 'a:, T: {} "fn f<'a, T>() where 'a:, T: {}" } } ``` Previously this assertion would fail because rustc renders the where-clause as `where 'a, T` which is invalid syntax. This PR makes the above assertion pass. This bug also affects `-Zunpretty=expanded`. The intention is for that to emit syntactically valid code, but the buggy output is not valid Rust syntax. ```console $ rustc <(echo "fn f<'a, T>() where 'a:, T: {}") -Zunpretty=expanded #![feature(prelude_import)] #![no_std] #[prelude_import] use ::std::prelude::rust_2015::*; #[macro_use] extern crate std; fn f<'a, T>() where 'a, T {} ``` ```console $ rustc <(echo "fn f<'a, T>() where 'a:, T: {}") -Zunpretty=expanded | rustc - error: expected `:`, found `,` --> :7:23 | 7 | fn f<'a, T>() where 'a, T {} | ^ expected `:` ```

remove the rest of unnecessary `to_string`

2022-06-17T09:48:09+00:00

Fix pretty printing of empty type bound lists in where-clause

2022-06-17T00:24:50+00:00

Do not suggest adding semicolon/changing delimiters for macros in item position that originates in macros

2022-06-16T02:19:31+00:00

Improve parsing errors and suggestions for bad if statements

2022-06-14T03:53:48+00:00

Rollup merge of #95211 - terrarier2111:improve-parser, r=compiler-errors

2022-06-13T22:47:22+00:00

Improve parser diagnostics This pr fixes https://github.com/rust-lang/rust/issues/93867 and contains a couple of diagnostics related changes to the parser. Here is a short list with some of the changes: - don't suggest the same thing that is the current token - suggest removing the current token if the following token is one of the suggestions (maybe incorrect) - tell the user to put a type or lifetime after where if there is none (as a warning) - reduce the amount of tokens suggested (via the new eat_noexpect and check_noexpect methods) If any of these changes are undesirable, i can remove them, thanks!

remove unnecessary `to_string` and `String::new` for `tool_only_span_suggestion`

2022-06-13T07:01:16+00:00

remove unnecessary `to_string` and `String::new`

2022-06-13T06:48:40+00:00

Improves parser diagnostics, fixes #93867

2022-06-12T15:48:52+00:00

use `create_snapshot_for_diagnostic` instead of `clone`

2022-06-12T08:27:36+00:00