Macro improvements #17838
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Macro improvements #17838
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cc #17830 Also, the first commit can be landed in a flash, but the second commit theoretically requires an RFC, so it may be worth separating them. |
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ok, I dropped second commit from this PR. |
…g options..." error in macros, which often occurs when trying to match parts of Rust syntax. For example, this matcher: `fn $name:ident( $($param:ident : $pty:ty),* )` would fail when parsing `fn foo()`, because macro parser wouldn't realize that an ident cannot start with `)`. This resolves rust-lang#5902, and at least partially mitigates rust-lang#9364 and rust-lang#3232.
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