``` $ ./run-test.sh std --target i686-pc-windows-gnu --lib f32 [...] error: multiple definitions of symbol `lgammaf_r` --> /home/r/.rustup/toolchains/miri/lib/rustlib/src/rust/library/std/src/f32.rs:1196:26 | 1196 | let x = unsafe { cmath::lgammaf_r(self, &mut signgamp) }; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ multiple definitions of symbol `lgammaf_r` | help: it's first defined here, in crate `compiler_builtins` --> /home/r/.cargo/registry/src/index.crates.io-6f17d22bba15001f/compiler_builtins-0.1.108/src/math.rs:102:1 | 102 | / intrinsics! { 103 | | pub extern "C" fn lgamma_r(x: f64, s: &mut i32) -> f64 { 104 | | let r = self::libm::lgamma_r(x); 105 | | *s = r.1; ... | 113 | | } 114 | | } | |_^ help: then it's defined here again, in crate `compiler_builtins` --> /home/r/.cargo/registry/src/index.crates.io-6f17d22bba15001f/compiler_builtins-0.1.108/src/math.rs:102:1 | 102 | / intrinsics! { 103 | | pub extern "C" fn lgamma_r(x: f64, s: &mut i32) -> f64 { 104 | | let r = self::libm::lgamma_r(x); 105 | | *s = r.1; ... | 113 | | } 114 | | } | |_^ = note: BACKTRACE (of the first span) on thread `f32::tests::test_ln_gamma`: = note: inside `realstd::f32::<impl f32>::ln_gamma` at /home/r/.rustup/toolchains/miri/lib/rustlib/src/rust/library/std/src/f32.rs:1196:26: 1196:63 note: inside `f32::tests::test_ln_gamma` --> library/std/src/f32/tests.rs:677:23 | 677 | assert_approx_eq!(1.0f32.ln_gamma().0, 0.0f32); | ^^^^^^^^^^^^^^^^^ note: inside closure --> library/std/src/f32/tests.rs:676:19 | 675 | #[test] | ------- in this procedural macro expansion 676 | fn test_ln_gamma() { | ^ = note: this error originates in the macro `intrinsics` which comes from the expansion of the attribute macro `test` (in Nightly builds, run with -Z macro-backtrace for more info) note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace error: aborting due to 1 previous error test f32::tests::test_ln_gamma ... error: test failed, to rerun pass `--lib` ``` This is of course twice the same symbol. But apparently we're getting compiler_builtins duplicated the same way core/alloc/std are duplicated.