rust/compiler/rustc_parse/src/parser/nonterminal.rs, branch 1.56.1

Use if-let guards in the codebase

2021-08-25T18:24:35+00:00

Suggest a path separator if a stray colon is found in a match arm

2021-07-13T23:15:59+00:00

Co-authored-by: Esteban Kuber

parser: Ensure that all nonterminals have tokens after parsing

2021-06-06T11:21:12+00:00

remove pat2021

2021-04-28T02:15:59+00:00

rename pat2015 to pat_param

2021-04-15T18:52:09+00:00

Implement token-based handling of attributes during expansion

2021-04-11T05:31:36+00:00

This PR modifies the macro expansion infrastructure to handle attributes in a fully token-based manner. As a result: * Derives macros no longer lose spans when their input is modified by eager cfg-expansion. This is accomplished by performing eager cfg-expansion on the token stream that we pass to the derive proc-macro * Inner attributes now preserve spans in all cases, including when we have multiple inner attributes in a row. This is accomplished through the following changes: * New structs `AttrAnnotatedTokenStream` and `AttrAnnotatedTokenTree` are introduced. These are very similar to a normal `TokenTree`, but they also track the position of attributes and attribute targets within the stream. They are built when we collect tokens during parsing. An `AttrAnnotatedTokenStream` is converted to a regular `TokenStream` when we invoke a macro. * Token capturing and `LazyTokenStream` are modified to work with `AttrAnnotatedTokenStream`. A new `ReplaceRange` type is introduced, which is created during the parsing of a nested AST node to make the 'outer' AST node aware of the attributes and attribute target stored deeper in the token stream. * When we need to perform eager cfg-expansion (either due to `#[derive]` or `#[cfg_eval]`), we tokenize and reparse our target, capturing additional information about the locations of `#[cfg]` and `#[cfg_attr]` attributes at any depth within the target. This is a performance optimization, allowing us to perform less work in the typical case where captured tokens never have eager cfg-expansion run.

Avoid double-collection for expression nonterminals

2021-03-25T22:05:49+00:00

Rollup merge of #83384 - mark-i-m:rename-pat2018, r=joshtriplett

2021-03-23T01:15:43+00:00

rename :pat2018 -> :pat2015 as requested by T-lang on zulip: https://rust-lang.zulipchat.com/#narrow/stream/213817-t-lang/topic/or.20patterns/near/231133873 No functional changes here... just renaming. r? `@nikomatsakis`

rename :pat2018 -> :pat215

2021-03-22T17:40:23+00:00

stabilize or_patterns

2021-03-20T00:45:32+00:00