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Fix an ICE on transmute goals with placeholders in param_env #151373

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rust-bors merged 1 commit into from
Jan 21, 2026
+22 −1
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Fix an ICE on transmute goals with placeholders in param_env #151373

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2 changes: 1 addition & 1 deletion compiler/rustc_next_trait_solver/src/solve/trait_goals.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -659,7 +659,7 @@ where
}

// `rustc_transmute` does not have support for type or const params
if goal.has_non_region_placeholders() {
if goal.predicate.has_non_region_placeholders() {
return Err(NoSolution);
}

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21 changes: 21 additions & 0 deletions tests/ui/transmutability/transmute-with-type-params.rs
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@@ -0,0 +1,21 @@
//@ revisions: current next
//@ ignore-compare-mode-next-solver (explicit revisions)
//@ [next] compile-flags: -Znext-solver
//@ check-pass

// A regression test for https://github.com/rust-lang/rust/issues/151300

#![feature(transmutability)]
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@lcnr lcnr Jan 20, 2026

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can you move this to the transmutability folder instead of the general next-solver one?

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@ShoyuVanilla ShoyuVanilla Jan 20, 2026

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Okay, I'll move it once I get home

use std::mem::TransmuteFrom;

pub fn is_maybe_transmutable<Src, Dst>()
where
Dst: TransmuteFrom<Src>,
{
}

fn function_with_generic<T>() {
is_maybe_transmutable::<(), ()>();
}

fn main() {}
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