Rollup merge of rust-lang#106366 - GuillaumeGomez:fix-rustdoc-ice-typedef-type-mismatch, r=notriddle

Fix rustdoc ICE on bad typedef with mismatching types

Fixes rust-lang#106226.
Fixes rust-lang#105742.
Fixes rust-lang#105737.
Fixes rust-lang#105334.
Fixes rust-lang#96287.

In this case, it's ok to replace the panic with `rustc_error::raise` because the compiler provided us with a `Error`.

r? `@notriddle`

Author: compiler-errors

src/librustdoc/clean/mod.rs

@@ -1853,7 +1853,7 @@ pub(crate) fn clean_middle_ty<'tcx>(
         ty::Placeholder(..) => panic!("Placeholder"),
         ty::GeneratorWitness(..) => panic!("GeneratorWitness"),
         ty::Infer(..) => panic!("Infer"),
-        ty::Error(_) => panic!("Error"),
+        ty::Error(_) => rustc_errors::FatalError.raise(),
     }
 }
 

src/test/rustdoc-ui/issue-105334.rs

@@ -0,0 +1,2 @@
+impl Vec< br##"*.."## > {}
+//~^ ERROR

src/test/rustdoc-ui/issue-105334.stderr

@@ -0,0 +1,9 @@
+error[E0747]: constant provided when a type was expected
+  --> $DIR/issue-105334.rs:1:11
+   |
+LL | impl Vec< br##"*.."## > {}
+   |           ^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0747`.

src/test/rustdoc-ui/issue-105737.rs

@@ -0,0 +1,4 @@
+impl Vec<lol> {}
+//~^ ERROR
+
+pub fn lol() {}

src/test/rustdoc-ui/issue-105737.stderr

@@ -0,0 +1,12 @@
+error[E0747]: constant provided when a type was expected
+  --> $DIR/issue-105737.rs:1:10
+   |
+LL | impl Vec<lol> {}
+   |          ^^^
+   |
+   = help: `lol` is a function item, not a type
+   = help: function item types cannot be named directly
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0747`.

src/test/rustdoc-ui/issue-105742.rs

@@ -0,0 +1,40 @@
+// compile-flags: -Znormalize-docs
+
+use std::ops::Index;
+
+pub fn next<'a, T>(s: &'a mut dyn SVec<Item = T, Output = T>) {
+//~^ ERROR
+//~^^ ERROR
+//~^^^ ERROR
+    let _ = s;
+}
+
+pub trait SVec: Index<
+    <Self as SVec>::Item,
+//~^ ERROR
+//~^^ ERROR
+//~^^^ ERROR
+//~^^^^ ERROR
+    Output = <Index<<Self as SVec>::Item,
+//~^ ERROR
+//~^^ ERROR
+//~^^^ ERROR
+//~^^^^ ERROR
+    Output = <Self as SVec>::Item> as SVec>::Item,
+//~^ ERROR
+//~^^ ERROR
+//~^^^ ERROR
+//~^^^^ ERROR
+//~^^^^^ ERROR
+//~^^^^^^ ERROR
+//~^^^^^^^ ERROR
+//~^^^^^^^^ ERROR
+> {
+    type Item<'a, T>;
+
+    fn len(&self) -> <Self as SVec>::Item;
+    //~^ ERROR
+    //~^^ ERROR
+    //~^^^ ERROR
+    //~^^^^ ERROR
+}