Fix ICE when a suffixed literal's type doesn't match the expected const arg type

lapla-cogito · lapla-cogito · commit b4cf9ddda78a · 2026-02-22T19:45:25.000+09:00
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
@@ -2851,6 +2851,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             if const_lit_matches_ty(tcx, &l.lit, l.ty, l.neg) {
                 tcx.at(expr.span)
                     .lit_to_const(l)
+                    .filter(|value| value.ty == l.ty)
                     .map(|value| ty::Const::new_value(tcx, value.valtree, value.ty))
             } else {
                 None
diff --git a/tests/ui/const-generics/mgca/type_const-assoc-mismatched-literal-suffix.rs b/tests/ui/const-generics/mgca/type_const-assoc-mismatched-literal-suffix.rs
@@ -0,0 +1,22 @@
+//@ compile-flags: -Zvalidate-mir
+
+// Regression test for https://github.com/rust-lang/rust/issues/152962
+
+#![feature(min_generic_const_args)]
+#![allow(incomplete_features)]
+
+pub struct A;
+
+pub trait Array {
+    type const LEN: usize;
+    fn arr() -> [u8; Self::LEN];
+}
+
+impl Array for A {
+    type const LEN: usize = 0u8;
+    //~^ ERROR mismatched types
+
+    fn arr() -> [u8; const { Self::LEN }] {}
+}
+
+fn main() {}
diff --git a/tests/ui/const-generics/mgca/type_const-assoc-mismatched-literal-suffix.stderr b/tests/ui/const-generics/mgca/type_const-assoc-mismatched-literal-suffix.stderr
@@ -0,0 +1,15 @@
+error[E0308]: mismatched types
+  --> $DIR/type_const-assoc-mismatched-literal-suffix.rs:16:29
+   |
+LL |     type const LEN: usize = 0u8;
+   |                             ^^^ expected `usize`, found `u8`
+   |
+help: change the type of the numeric literal from `u8` to `usize`
+   |
+LL -     type const LEN: usize = 0u8;
+LL +     type const LEN: usize = 0usize;
+   |
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/const-generics/mgca/type_const-mismatched-literal-suffix.rs b/tests/ui/const-generics/mgca/type_const-mismatched-literal-suffix.rs
@@ -0,0 +1,13 @@
+//@ compile-flags: --emit=link
+
+// Regression test for https://github.com/rust-lang/rust/issues/152653
+
+#![feature(min_generic_const_args)]
+#![expect(incomplete_features)]
+
+type const CONST: usize = 1_i32;
+//~^ ERROR mismatched types
+
+fn main() {
+    CONST;
+}
diff --git a/tests/ui/const-generics/mgca/type_const-mismatched-literal-suffix.stderr b/tests/ui/const-generics/mgca/type_const-mismatched-literal-suffix.stderr
@@ -0,0 +1,15 @@
+error[E0308]: mismatched types
+  --> $DIR/type_const-mismatched-literal-suffix.rs:8:27
+   |
+LL | type const CONST: usize = 1_i32;
+   |                           ^^^^^ expected `usize`, found `i32`
+   |
+help: change the type of the numeric literal from `i32` to `usize`
+   |
+LL - type const CONST: usize = 1_i32;
+LL + type const CONST: usize = 1_usize;
+   |
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/const-generics/mgca/type_const-mismatched-types.rs b/tests/ui/const-generics/mgca/type_const-mismatched-types.rs
@@ -2,11 +2,9 @@
 #![feature(min_generic_const_args)]
 
 type const FREE: u32 = 5_usize;
-//~^ ERROR the constant `5` is not of type `u32`
-//~| ERROR mismatched types
+//~^ ERROR mismatched types
 
 type const FREE2: isize = FREE;
-//~^ ERROR the constant `5` is not of type `isize`
 
 trait Tr {
     type const N: usize;
diff --git a/tests/ui/const-generics/mgca/type_const-mismatched-types.stderr b/tests/ui/const-generics/mgca/type_const-mismatched-types.stderr
@@ -1,21 +1,3 @@
-error: the constant `5` is not of type `u32`
-  --> $DIR/type_const-mismatched-types.rs:4:1
-   |
-LL | type const FREE: u32 = 5_usize;
-   | ^^^^^^^^^^^^^^^^^^^^ expected `u32`, found `usize`
-
-error: the constant `5` is not of type `isize`
-  --> $DIR/type_const-mismatched-types.rs:8:1
-   |
-LL | type const FREE2: isize = FREE;
-   | ^^^^^^^^^^^^^^^^^^^^^^^ expected `isize`, found `usize`
-
-error[E0308]: mismatched types
-  --> $DIR/type_const-mismatched-types.rs:16:27
-   |
-LL |     type const N: usize = false;
-   |                           ^^^^^ expected `usize`, found `bool`
-
 error[E0308]: mismatched types
   --> $DIR/type_const-mismatched-types.rs:4:24
    |
@@ -28,6 +10,12 @@ LL - type const FREE: u32 = 5_usize;
 LL + type const FREE: u32 = 5_u32;
    |
 
-error: aborting due to 4 previous errors
+error[E0308]: mismatched types
+  --> $DIR/type_const-mismatched-types.rs:14:27
+   |
+LL |     type const N: usize = false;
+   |                           ^^^^^ expected `usize`, found `bool`
+
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/const-generics/type-dependent/type-mismatch.full.stderr b/tests/ui/const-generics/type-dependent/type-mismatch.full.stderr
@@ -1,15 +1,3 @@
-error: the constant `1` is not of type `u8`
-  --> $DIR/type-mismatch.rs:8:27
-   |
-LL |     assert_eq!(R.method::<1u16>(), 1);
-   |                           ^^^^ expected `u8`, found `u16`
-   |
-note: required by a const generic parameter in `R::method`
-  --> $DIR/type-mismatch.rs:5:15
-   |
-LL |     fn method<const N: u8>(&self) -> u8 { N }
-   |               ^^^^^^^^^^^ required by this const generic parameter in `R::method`
-
 error[E0308]: mismatched types
   --> $DIR/type-mismatch.rs:8:27
    |
@@ -22,6 +10,6 @@ LL -     assert_eq!(R.method::<1u16>(), 1);
 LL +     assert_eq!(R.method::<1u8>(), 1);
    |
 
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/const-generics/type-dependent/type-mismatch.min.stderr b/tests/ui/const-generics/type-dependent/type-mismatch.min.stderr
@@ -1,15 +1,3 @@
-error: the constant `1` is not of type `u8`
-  --> $DIR/type-mismatch.rs:8:27
-   |
-LL |     assert_eq!(R.method::<1u16>(), 1);
-   |                           ^^^^ expected `u8`, found `u16`
-   |
-note: required by a const generic parameter in `R::method`
-  --> $DIR/type-mismatch.rs:5:15
-   |
-LL |     fn method<const N: u8>(&self) -> u8 { N }
-   |               ^^^^^^^^^^^ required by this const generic parameter in `R::method`
-
 error[E0308]: mismatched types
   --> $DIR/type-mismatch.rs:8:27
    |
@@ -22,6 +10,6 @@ LL -     assert_eq!(R.method::<1u16>(), 1);
 LL +     assert_eq!(R.method::<1u8>(), 1);
    |
 
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/const-generics/type-dependent/type-mismatch.rs b/tests/ui/const-generics/type-dependent/type-mismatch.rs
@@ -6,6 +6,5 @@ impl R {
 }
 fn main() {
     assert_eq!(R.method::<1u16>(), 1);
-    //~^ ERROR the constant `1` is not of type `u8`
-    //~| ERROR mismatched types
+    //~^ ERROR mismatched types
 }
diff --git a/tests/ui/consts/const-eval/array-len-mismatch-type.rs b/tests/ui/consts/const-eval/array-len-mismatch-type.rs
@@ -1,8 +1,5 @@
 //! Regression test for <https://github.com/rust-lang/rust/issues/133966>
 pub struct Data([[&'static str]; 5_i32]);
-//~^ ERROR the constant `5` is not of type `usize`
-//~| ERROR the size for values of type `[&'static str]` cannot be known at compilation time
-//~| ERROR mismatched types
+//~^ ERROR mismatched types
 const _: &'static Data = unsafe { &*(&[] as *const Data) };
-//~^ ERROR the type `[[&str]; 5]` has an unknown layout
 fn main() {}
diff --git a/tests/ui/consts/const-eval/array-len-mismatch-type.stderr b/tests/ui/consts/const-eval/array-len-mismatch-type.stderr
@@ -1,26 +1,3 @@
-error: the constant `5` is not of type `usize`
-  --> $DIR/array-len-mismatch-type.rs:2:17
-   |
-LL | pub struct Data([[&'static str]; 5_i32]);
-   |                 ^^^^^^^^^^^^^^^^^^^^^^^ expected `usize`, found `i32`
-   |
-   = note: the length of array `[[&'static str]; 5]` must be type `usize`
-
-error[E0277]: the size for values of type `[&'static str]` cannot be known at compilation time
-  --> $DIR/array-len-mismatch-type.rs:2:17
-   |
-LL | pub struct Data([[&'static str]; 5_i32]);
-   |                 ^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
-   |
-   = help: the trait `Sized` is not implemented for `[&'static str]`
-   = note: slice and array elements must have `Sized` type
-
-error[E0080]: the type `[[&str]; 5]` has an unknown layout
-  --> $DIR/array-len-mismatch-type.rs:6:39
-   |
-LL | const _: &'static Data = unsafe { &*(&[] as *const Data) };
-   |                                       ^^ evaluation of `_` failed here
-
 error[E0308]: mismatched types
   --> $DIR/array-len-mismatch-type.rs:2:34
    |
@@ -33,7 +10,6 @@ LL - pub struct Data([[&'static str]; 5_i32]);
 LL + pub struct Data([[&'static str]; 5_usize]);
    |
 
-error: aborting due to 4 previous errors
+error: aborting due to 1 previous error
 
-Some errors have detailed explanations: E0080, E0277, E0308.
-For more information about an error, try `rustc --explain E0080`.
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/repeat-expr/repeat_count.rs b/tests/ui/repeat-expr/repeat_count.rs
@@ -27,10 +27,7 @@ fn main() {
     //~| NOTE expected `usize`, found `isize`
     //~| NOTE `-1_isize` cannot fit into type `usize`
     let h = [0; 4u8];
-    //~^ ERROR the constant `4` is not of type `usize`
-    //~| NOTE expected `usize`, found `u8`
-    //~| NOTE the length of array `[{integer}; 4]` must be type `usize`
-    //~| ERROR mismatched types
+    //~^ ERROR mismatched types
     //~| NOTE expected `usize`, found `u8`
     struct I {
         i: (),
diff --git a/tests/ui/repeat-expr/repeat_count.stderr b/tests/ui/repeat-expr/repeat_count.stderr
@@ -50,20 +50,6 @@ LL |     let g = [0_usize; -1_isize];
    |
    = note: `-1_isize` cannot fit into type `usize`
 
-error: the constant `4` is not of type `usize`
-  --> $DIR/repeat_count.rs:29:13
-   |
-LL |     let h = [0; 4u8];
-   |             ^^^^^^^^ expected `usize`, found `u8`
-   |
-   = note: the length of array `[{integer}; 4]` must be type `usize`
-
-error[E0308]: mismatched types
-  --> $DIR/repeat_count.rs:38:17
-   |
-LL |     let i = [0; I { i: () }];
-   |                 ^^^^^^^^^^^ expected `usize`, found `I`
-
 error[E0308]: mismatched types
   --> $DIR/repeat_count.rs:29:17
    |
@@ -76,7 +62,13 @@ LL -     let h = [0; 4u8];
 LL +     let h = [0; 4usize];
    |
 
-error: aborting due to 10 previous errors
+error[E0308]: mismatched types
+  --> $DIR/repeat_count.rs:35:17
+   |
+LL |     let i = [0; I { i: () }];
+   |                 ^^^^^^^^^^^ expected `usize`, found `I`
+
+error: aborting due to 9 previous errors
 
 Some errors have detailed explanations: E0308, E0435.
 For more information about an error, try `rustc --explain E0308`.

Original file line number	Diff line number	Diff line change
`@@ -6,6 +6,5 @@ impl R {`
`6`	`6`	`}`
`7`	`7`	`fn main() {`
`8`	`8`	`assert_eq!(R.method::<1u16>(), 1);`
`9`		- //~^ ERROR the constant `1` is not of type `u8`
`10`		`- //~\| ERROR mismatched types`
	`9`	`+ //~^ ERROR mismatched types`
`11`	`10`	`}`