diff --git a/tests/ui/fn/fn-trait-use-named-params-issue-140169.rs b/tests/ui/fn/fn-trait-use-named-params-issue-140169.rs
new file mode 100644
index 000000000000..fae5f6c15193
--- /dev/null
+++ b/tests/ui/fn/fn-trait-use-named-params-issue-140169.rs
@@ -0,0 +1,6 @@
+fn g(_: fn(a: u8)) {}
+fn x(_: impl Fn(u8, vvvv: u8)) {} //~ ERROR expected one of `!`, `(`, `)`, `+`, `,`, `::`, or `<`, found `:`
+fn y(_: impl Fn(aaaa: u8, u8)) {} //~ ERROR expected one of `!`, `(`, `)`, `+`, `,`, `::`, or `<`, found `:`
+fn z(_: impl Fn(aaaa: u8, vvvv: u8)) {} //~ ERROR expected one of `!`, `(`, `)`, `+`, `,`, `::`, or `<`, found `:`
+
+fn main(){}
diff --git a/tests/ui/fn/fn-trait-use-named-params-issue-140169.stderr b/tests/ui/fn/fn-trait-use-named-params-issue-140169.stderr
new file mode 100644
index 000000000000..e599afb1345f
--- /dev/null
+++ b/tests/ui/fn/fn-trait-use-named-params-issue-140169.stderr
@@ -0,0 +1,20 @@
+error: expected one of `!`, `(`, `)`, `+`, `,`, `::`, or `<`, found `:`
+  --> $DIR/fn-trait-use-named-params-issue-140169.rs:2:25
+   |
+LL | fn x(_: impl Fn(u8, vvvv: u8)) {}
+   |                         ^ expected one of 7 possible tokens
+
+error: expected one of `!`, `(`, `)`, `+`, `,`, `::`, or `<`, found `:`
+  --> $DIR/fn-trait-use-named-params-issue-140169.rs:3:21
+   |
+LL | fn y(_: impl Fn(aaaa: u8, u8)) {}
+   |                     ^ expected one of 7 possible tokens
+
+error: expected one of `!`, `(`, `)`, `+`, `,`, `::`, or `<`, found `:`
+  --> $DIR/fn-trait-use-named-params-issue-140169.rs:4:21
+   |
+LL | fn z(_: impl Fn(aaaa: u8, vvvv: u8)) {}
+   |                     ^ expected one of 7 possible tokens
+
+error: aborting due to 3 previous errors
+