Attribute rework: a parser for single attributes without arguments #142964
+88
−87
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Part of #131229
r? @jdonszelmann
I think code (with comments) speaks for itself.
The only subtlety: now
#[cold]
&#[no_mangle]
do not get thrown away when malformed (i.e. have arguments). This doesn't matter too much (I think), because an error gets emitted either way, so the compilation will not finish.