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pure macros #3380

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jesse99 opened this issue Sep 4, 2012 · 1 comment
Closed

pure macros #3380

jesse99 opened this issue Sep 4, 2012 · 1 comment
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A-frontend Area: frontend (errors, parsing and HIR) A-syntaxext Area: Syntax extensions

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@jesse99
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jesse99 commented Sep 4, 2012

It would be slick if macros could match a pure_expr. Stuff like logging macros could use a pure_expr to ensure that the code behaves the same way with logging on or off.
@graydon
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graydon commented Sep 5, 2012

Purity checking happens much later than syntax expansion. We could force the result of a macro to be pure by wrapping it in a suitable function and passing it to some context that requires purity, but in general this is not a syntactic issue. Closing WONTFIX.

@graydon graydon closed this as completed Sep 5, 2012
RalfJung pushed a commit to RalfJung/rust that referenced this issue Mar 15, 2024
@bors
Auto merge of rust-lang#3380 - RalfJung:cron, r=RalfJung
ee2bd39 
make cron job topic names more consistent
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A-frontend Area: frontend (errors, parsing and HIR) A-syntaxext Area: Syntax extensions
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