Add error for trailing angle brackets.

This commit adds a error (and accompanying machine applicable
suggestion) for trailing angle brackets on function calls with a
turbofish.

4 files changed, 86 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-54521-1.rs b/src/test/ui/issues/issue-54521-1.rs
new file mode 100644
index 00000000000..d6a14a6e11f
--- /dev/null
+++ b/src/test/ui/issues/issue-54521-1.rs
@@ -0,0 +1,16 @@
+// compile-pass
+
+// This test checks that the `remove extra angle brackets` error doesn't happen for some
+// potential edge-cases..
+
+struct X {
+    len: u32,
+}
+
+fn main() {
+    let x = X { len: 3 };
+
+    let _ = x.len > (3);
+
+    let _ = x.len >> (3);
+}
diff --git a/src/test/ui/issues/issue-54521.fixed b/src/test/ui/issues/issue-54521.fixed
new file mode 100644
index 00000000000..84ab6866cf1
--- /dev/null
+++ b/src/test/ui/issues/issue-54521.fixed
@@ -0,0 +1,22 @@
+// run-rustfix
+
+// This test checks that the following error is emitted and the suggestion works:
+//
+// ```
+// let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>>>();
+//                                                        ^^ help: remove extra angle brackets
+// ```
+
+fn main() {
+    let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>();
+    //~^ ERROR unmatched angle bracket
+
+    let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>();
+    //~^ ERROR unmatched angle bracket
+
+    let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>();
+    //~^ ERROR unmatched angle bracket
+
+    let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>();
+    //~^ ERROR unmatched angle bracket
+}
diff --git a/src/test/ui/issues/issue-54521.rs b/src/test/ui/issues/issue-54521.rs
new file mode 100644
index 00000000000..f1d68504178
--- /dev/null
+++ b/src/test/ui/issues/issue-54521.rs
@@ -0,0 +1,22 @@
+// run-rustfix
+
+// This test checks that the following error is emitted and the suggestion works:
+//
+// ```
+// let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>>>();
+//                                                        ^^ help: remove extra angle brackets
+// ```
+
+fn main() {
+    let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>>>>>();
+    //~^ ERROR unmatched angle bracket
+
+    let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>>>>();
+    //~^ ERROR unmatched angle bracket
+
+    let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>>>();
+    //~^ ERROR unmatched angle bracket
+
+    let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>>();
+    //~^ ERROR unmatched angle bracket
+}
diff --git a/src/test/ui/issues/issue-54521.stderr b/src/test/ui/issues/issue-54521.stderr
new file mode 100644
index 00000000000..a67e9ca8daf
--- /dev/null
+++ b/src/test/ui/issues/issue-54521.stderr
@@ -0,0 +1,26 @@
+error: unmatched angle bracket
+  --> $DIR/issue-54521.rs:11:60
+   |
+LL |     let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>>>>>();
+   |                                                            ^^^^ help: remove extra angle bracket
+
+error: unmatched angle bracket
+  --> $DIR/issue-54521.rs:14:60
+   |
+LL |     let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>>>>();
+   |                                                            ^^^ help: remove extra angle bracket
+
+error: unmatched angle bracket
+  --> $DIR/issue-54521.rs:17:60
+   |
+LL |     let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>>>();
+   |                                                            ^^ help: remove extra angle bracket
+
+error: unmatched angle bracket
+  --> $DIR/issue-54521.rs:20:60
+   |
+LL |     let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>>();
+   |                                                            ^ help: remove extra angle bracket
+
+error: aborting due to 4 previous errors
+