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decl macro 2.0 doesn't allow trailing comma #63102

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bjorn3 opened this issue Jul 29, 2019 · 2 comments · Fixed by #63198
Closed

decl macro 2.0 doesn't allow trailing comma #63102

bjorn3 opened this issue Jul 29, 2019 · 2 comments · Fixed by #63198
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A-macros-2.0 Area: Declarative macros 2.0 (#39412) A-parser Area: The parsing of Rust source code to an AST. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@bjorn3
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bjorn3 commented Jul 29, 2019 

macro abc {
    () => {},

(Playground)

Errors:

   Compiling playground v0.0.1 (/playground)
error: unexpected end of macro invocation
 --> src/lib.rs:2:14
  |
2 |     () => {},
  |              ^ missing tokens in macro arguments

error: aborting due to previous error

error: Could not compile `playground`.

To learn more, run the command again with --verbose.
@jonas-schievink jonas-schievink added A-macros-2.0 Area: Declarative macros 2.0 (#39412) A-parser Area: The parsing of Rust source code to an AST. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jul 29, 2019
@matthewjasper
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But they do accept a trailing ;: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=f8bd2841ec49d0222be9ad6124bdd0a4

@bjorn3
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bjorn3 commented Jul 29, 2019

Maybe someone forgot to change the trailing ; into , when changing the separating ; into , in the (copied?) parse code?

@rbartlensky rbartlensky mentioned this issue Aug 1, 2019
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Centril added a commit to Centril/rust that referenced this issue Aug 2, 2019
@Centril
Rollup merge of rust-lang#63198 - rbartlensky:fix-macro-trailing-comm…
89dce46 
…a, r=petrochenkov

Allow trailing comma in macro 2.0 declarations.

This should hopefully close rust-lang#63102.
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A-macros-2.0 Area: Declarative macros 2.0 (#39412) A-parser Area: The parsing of Rust source code to an AST. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Allow trailing comma in macro 2.0 declarations.
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@jonas-schievink @bjorn3 @matthewjasper