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

Merged

bors merged 12 commits into

rust-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
joshtriplett
committed
2054a0c
mbe: Parse macro attribute rules
joshtriplett
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bad0d45
mbe: Fix error message for using a macro with no `attr` rules as an attribute
joshtriplett
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f0a5e70
mbe: Emit an error if a macro call has no function-like rules
joshtriplett
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0cc0b11
mbe: Handle applying attribute rules with paths
joshtriplett
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34be8ab
mbe: Handle local `macro_rules` attr resolution
joshtriplett
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549c2fe
mbe: Add test for `macro_rules` attributes
joshtriplett
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4f999f7
mbe: Add test for attribute expansion with `compile_error!`
joshtriplett
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bd5206e
mbe: Add a test for calling a macro with no function-like rules
joshtriplett
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1500195
mbe: Add parser test for macro attribute recovery
joshtriplett
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9a9ccc0
mbe: Add a test confirming that a macro attribute can apply itself recursively
joshtriplett
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489734c
mbe: Add a test checking for infinite recursion in macro attributes
joshtriplett
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f88839d