Rollup merge of #104233 - compiler-errors:issue-104209, r=lcnr

Don't ICE when encountering `ConstKind::Error` in `RequiredConstsVisitor`

Fixes #104209

Author: Manishearth

compiler/rustc_mir_transform/src/required_consts.rs

@@ -17,7 +17,7 @@ impl<'tcx> Visitor<'tcx> for RequiredConstsVisitor<'_, 'tcx> {
         let literal = constant.literal;
         match literal {
             ConstantKind::Ty(c) => match c.kind() {
-                ConstKind::Param(_) => {}
+                ConstKind::Param(_) | ConstKind::Error(_) => {}
                 _ => bug!("only ConstKind::Param should be encountered here, got {:#?}", c),
             },
             ConstantKind::Unevaluated(..) => self.required_consts.push(*constant),

src/test/ui/consts/invalid-const-in-body.rs

@@ -0,0 +1,6 @@
+fn f() -> impl Sized {
+    2.0E
+    //~^ ERROR expected at least one digit in exponent
+}
+
+fn main() {}

src/test/ui/consts/invalid-const-in-body.stderr

@@ -0,0 +1,8 @@
+error: expected at least one digit in exponent
+  --> $DIR/invalid-const-in-body.rs:2:5
+   |
+LL |     2.0E
+   |     ^^^^
+
+error: aborting due to previous error
+