Auto merge of #60048 - estebank:issue-54954, r=sanxiyn

Fix ICE on const evaluation of const method

Fix #54954.

2 files changed, 35 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-54954.rs b/src/test/ui/issues/issue-54954.rs
new file mode 100644
index 00000000000..40045bc758c
--- /dev/null
+++ b/src/test/ui/issues/issue-54954.rs
@@ -0,0 +1,19 @@
+#![feature(const_fn)]
+
+const ARR_LEN: usize = Tt::const_val::<[i8; 123]>();
+//~^ ERROR constant contains unimplemented expression type
+
+trait Tt {
+    const fn const_val<T: Sized>() -> usize {
+    //~^ ERROR trait fns cannot be declared const
+        core::mem::size_of::<T>()
+    }
+}
+
+fn f(z: [f32; ARR_LEN]) -> [f32; ARR_LEN] {
+    z
+}
+
+fn main() {
+    let _ = f([1f32; ARR_LEN]);
+}
diff --git a/src/test/ui/issues/issue-54954.stderr b/src/test/ui/issues/issue-54954.stderr
new file mode 100644
index 00000000000..dd6389b8b60
--- /dev/null
+++ b/src/test/ui/issues/issue-54954.stderr
@@ -0,0 +1,16 @@
+error[E0379]: trait fns cannot be declared const
+  --> $DIR/issue-54954.rs:7:5
+   |
+LL |     const fn const_val<T: Sized>() -> usize {
+   |     ^^^^^ trait fns cannot be const
+
+error[E0019]: constant contains unimplemented expression type
+  --> $DIR/issue-54954.rs:3:24
+   |
+LL | const ARR_LEN: usize = Tt::const_val::<[i8; 123]>();
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 2 previous errors
+
+Some errors occurred: E0019, E0379.
+For more information about an error, try `rustc --explain E0019`.