literal_string_with_formatting_args should provide a way to declare formatting macro

[ia0]

Description

If one wants to provide their own formatting macros (either as proc-macro or wrappers around existing formatting macros), they will get the lint at every call-site.

How does the lint check that a macro is a formatting macro? Does it have access to attributes declared on the macro definition?

If there is (or will be) such a feature, it should be documented in the lint documentation.

Version

rustc 1.86.0-nightly (48a426eca 2025-01-12)
binary: rustc
commit-hash: 48a426eca9df23b24b3559e545cf88dee61d4de9
commit-date: 2025-01-12
host: x86_64-unknown-linux-gnu
release: 1.86.0-nightly
LLVM version: 19.1.6

Additional Labels

No response

[joshtriplett]

This should allow declaring both macros and functions that accept arguments whose strings may look like they contain formatting args.

[ia0]

Good point! I assumed the lint triggered only on macros.