Implement declarative (`macro_rules!`) attribute macros (RFC 3697)#144579

Merged

bors merged 12 commits intorust-lang:masterfrom

joshtriplett:mbe-attr

Aug 9, 2025

Commits on Aug 8, 2025

mbe: In error messages, don't assume attributes are always proc macros
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mbe: Parse macro attribute rules
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mbe: Fix error message for using a macro with no `attr` rules as an attribute
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mbe: Emit an error if a macro call has no function-like rules
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mbe: Handle applying attribute rules with paths
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mbe: Handle local `macro_rules` attr resolution
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mbe: Add test for `macro_rules` attributes
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mbe: Add test for attribute expansion with `compile_error!`
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mbe: Add a test for calling a macro with no function-like rules
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mbe: Add parser test for macro attribute recovery
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mbe: Add a test confirming that a macro attribute can apply itself recursively
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mbe: Add a test checking for infinite recursion in macro attributes
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