test: Add a test for trimming multiline suggestions

Author: Muscraft

tests/ui/error-emitter/trimmed_multiline_suggestion.rs

@@ -0,0 +1,14 @@
+//@ compile-flags: -Z ui-testing=no
+fn function_with_lots_of_arguments(a: i32, b: char, c: i32, d: i32, e: i32, f: i32) {}
+
+fn main() {
+ let variable_name = 42;
+ function_with_lots_of_arguments(
+ variable_name,
+ variable_name,
+ variable_name,
+ variable_name,
+ variable_name,
+ );
+ //~^^^^^^^ ERROR this function takes 6 arguments but 5 arguments were supplied [E0061]
+}

tests/ui/error-emitter/trimmed_multiline_suggestion.stderr

@@ -0,0 +1,25 @@
+error[E0061]: this function takes 6 arguments but 5 arguments were supplied
+ --> $DIR/trimmed_multiline_suggestion.rs:6:5
+ |
+6 | function_with_lots_of_arguments(
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+7 | variable_name,
+8 | variable_name,
+ | ------------- argument #2 of type `char` is missing
+ |
+note: function defined here
+ --> $DIR/trimmed_multiline_suggestion.rs:2:4
+ |
+2 | fn function_with_lots_of_arguments(a: i32, b: char, c: i32, d: i32, e: i32, f: i32) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -------
+help: provide the argument
+ |
+8 | function_with_lots_of_arguments(
+9 | variable_name,
+10~ /* char */,
+11~ variable_name,
+ |
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0061`.