Fix closure arg extraction in extract_callable_info

2 files changed, 27 insertions, 0 deletions

diff --git a/tests/ui/closures/correct-args-on-call-suggestion.rs b/tests/ui/closures/correct-args-on-call-suggestion.rs
new file mode 100644
index 00000000000..fa7915a7c03
--- /dev/null
+++ b/tests/ui/closures/correct-args-on-call-suggestion.rs
@@ -0,0 +1,7 @@
+// Ensure we give the right args when we suggest calling a closure.
+
+fn main() {
+    let x = |a: i32, b: i32| a + b;
+    let y: i32 = x;
+    //~^ ERROR mismatched types
+}
diff --git a/tests/ui/closures/correct-args-on-call-suggestion.stderr b/tests/ui/closures/correct-args-on-call-suggestion.stderr
new file mode 100644
index 00000000000..2613c7776b2
--- /dev/null
+++ b/tests/ui/closures/correct-args-on-call-suggestion.stderr
@@ -0,0 +1,20 @@
+error[E0308]: mismatched types
+  --> $DIR/correct-args-on-call-suggestion.rs:5:18
+   |
+LL |     let x = |a: i32, b: i32| a + b;
+   |             ---------------- the found closure
+LL |     let y: i32 = x;
+   |            ---   ^ expected `i32`, found closure
+   |            |
+   |            expected due to this
+   |
+   = note: expected type `i32`
+           found closure `{closure@$DIR/correct-args-on-call-suggestion.rs:4:13: 4:29}`
+help: use parentheses to call this closure
+   |
+LL |     let y: i32 = x(/* i32 */, /* i32 */);
+   |                   ++++++++++++++++++++++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.