Add regression test for patterns support in "jump to def" feature

tests/rustdoc/jump-to-def-pats.rs

@@ -0,0 +1,52 @@
+// This test ensures that patterns also get a link generated.
+
+//@ compile-flags: -Zunstable-options --generate-link-to-definition
+
+#![crate_name = "foo"]
+
+//@ has 'src/foo/jump-to-def-pats.rs.html'
+
+use std::fmt;
+
+pub enum MyEnum<T, E> {
+    Ok(T),
+    Err(E),
+    Some(T),
+    None,
+}
+
+pub enum X {
+    A,
+}
+
+pub fn foo() -> Result<(), ()> {
+    // FIXME: would be nice to be able to check both the class and the href at the same time so
+    // we could check the text as well...
+    //@ has - '//a[@class="prelude-val"]/@href' '{{channel}}/core/result/enum.Result.html#variant.Ok'
+    //@ has - '//a[@href="{{channel}}/core/result/enum.Result.html#variant.Ok"]' 'Ok'
+    Ok(())
+}
+
+impl<T, E> fmt::Display for MyEnum<T, E> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            //@ has - '//a[@href="#12"]' 'Self::Ok'
+            Self::Ok(_) => f.write_str("MyEnum::Ok"),
+            //@ has - '//a[@href="#13"]' 'MyEnum::Err'
+            MyEnum::Err(_) => f.write_str("MyEnum::Err"),
+            //@ has - '//a[@href="#14"]' 'Self::Some'
+            Self::Some(_) => f.write_str("MyEnum::Some"),
+            //@ has - '//a[@href="#15"]' 'Self::None'
+            Self::None => f.write_str("MyEnum::None"),
+        }
+    }
+}
+
+impl X {
+    fn p(&self) -> &str {
+        match self {
+            //@ has - '//a[@href="#19"]' 'Self::A'
+            Self::A => "X::A",
+        }
+    }
+}