Lint against named asm labels#87324
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bors merged 8 commits intorust-lang:masterfrom Aug 14, 2021
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This adds a deny-by-default lint to prevent the use of named labels in inline
asm!. Without a solution to #81088 about whether the compiler should rewrite named labels or a special syntax for labels, a lint against them should prevent users from writing assembly that could break for internal compiler reasons, such as inlining or anything else that could change the number of actual inline assembly blocks emitted.This does not resolve the issue with rewriting labels, that still needs a decision if the compiler should do any more work to try to make them work.