Auto merge of #85479 - Stupremee:render-Self_as-type-casts, r=CraftSpider

rustdoc: render `<Self as X>::Y` type casts properly

Rustdoc didn't render any `<Self as X>` casts which causes invalid code inside the documentation. This is fixed by this PR by checking if the target type `X` is different from `Self`, and if so, it will render a typecast.

Resolves #85454

1 files changed, 17 insertions, 0 deletions

diff --git a/src/test/rustdoc/issue-85454.rs b/src/test/rustdoc/issue-85454.rs
new file mode 100644
index 00000000000..45664dfc382
--- /dev/null
+++ b/src/test/rustdoc/issue-85454.rs
@@ -0,0 +1,17 @@
+// @has issue_85454/trait.FromResidual.html
+// @has - '//pre[@class="rust trait"]' 'pub trait FromResidual<R = <Self as Try>::Residual> { fn from_residual(residual: R) -> Self; }'
+pub trait FromResidual<R = <Self as Try>::Residual> {
+    fn from_residual(residual: R) -> Self;
+}
+
+pub trait Try: FromResidual {
+    type Output;
+    type Residual;
+    fn from_output(output: Self::Output) -> Self;
+    fn branch(self) -> ControlFlow<Self::Residual, Self::Output>;
+}
+
+pub enum ControlFlow<B, C = ()> {
+    Continue(C),
+    Break(B),
+}