match_same_arms reports same arm when strings in macro calls are different

[ShakenCodes]

Summary

A match statement with arms that differ by the contents of string data passed into a macro falsely reports the match_same_arms.

Calling the println!() macro appears to works as intended, so there may already be special case testing for it. Functions calls with differing string data appear to work as intended. Functions and macro calls with differing numeric literal data appear to work as intended.

Lint Name

match_same_arms

Reproducer

I tried this code:

#![deny(clippy::match_same_arms)]

// Cargo.toml [dependencies] includes:
// defmt = "*"

pub enum Arms {
    This,
    That,
}

pub fn print_arms(a: Arms) {
    // defmt::info!() is a macro similar to println!(), used in embedded systems.
    // Clearly the two arms generate very different results,
    //  but the second gets flagged by match_same_arms 
    match a {
        Arms::This => defmt::info!("This"),
        Arms::That => defmt::info!("That"),
    }
}

I saw this happen:

% cargo clippy
    Checking replicate_match_same_arms_with_different_strings v0.1.0 (.../replicate_match_same_arms_with_different_strings)
error: this match arm has an identical body to another arm
  --> src/lib.rs:11:9
   |
11 |         Arms::That => defmt::info!("That"),
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: try changing either arm body
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_same_arms
note: the lint level is defined here
  --> src/lib.rs:1:9
   |
1  | #![deny(clippy::match_same_arms)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^
help: or try merging the arm patterns
   |
11 |         Arms::That | Arms::This => defmt::info!("That"),
   |         ~~~~~~~~~~~~~~~~~~~~~~~
help: and remove this obsolete arm
   |
10 -         Arms::This => defmt::info!("This"),
   |

error: could not compile `replicate_match_same_arms_with_different_strings` (lib) due to 1 previous error
%

I expected to see this happen: No error.

Version

rustc 1.81.0 (eeb90cda1 2024-09-04) binary: rustc commit-hash: eeb90cda1969383f56a2637cbd3037bdf598841c commit-date: 2024-09-04 host: aarch64-apple-darwin release: 1.81.0 LLVM version: 18.1.7

Additional Labels

No response