remove redundant test

tests/ui/closures/varargs-in-closure-isnt-supported.rs

@@ -1,10 +0,0 @@
-// var-args are not supported in closures, ensure we don't misdirect people (#146489)
-#![feature(c_variadic)]
-
-unsafe extern "C" fn thats_not_a_pattern(mut ap: ...) -> u32 {
-    let mut lol = |...| (); //~ ERROR: unexpected `...`
-    unsafe { ap.arg::<u32>() } //~^ NOTE: C-variadic type `...` is not allowed here
-    //~| NOTE: not a valid pattern
-}
-
-fn main() {}

tests/ui/closures/varargs-in-closure-isnt-supported.stderr

@@ -1,10 +0,0 @@
-error: unexpected `...`
-  --> $DIR/varargs-in-closure-isnt-supported.rs:5:20
-   |
-LL |     let mut lol = |...| ();
-   |                    ^^^ not a valid pattern
-   |
-   = note: C-variadic type `...` is not allowed here
-
-error: aborting due to 1 previous error
-