Move /src/test to /tests

tests/ui/argument-suggestions/basic.rs

@@ -0,0 +1,28 @@
+// Some basic "obvious" cases for the heuristic error messages added for #65853
+// One for each of the detected cases
+
+enum E { X, Y }
+enum F { X2, Y2 }
+struct G {}
+struct H {}
+struct X {}
+struct Y {}
+struct Z {}
+
+
+fn invalid(_i: u32) {}
+fn extra() {}
+fn missing(_i: u32) {}
+fn swapped(_i: u32, _s: &str) {}
+fn permuted(_x: X, _y: Y, _z: Z) {}
+
+fn main() {
+    invalid(1.0); //~ ERROR mismatched types
+    extra(""); //~ ERROR function takes
+    missing(); //~ ERROR function takes
+    swapped("", 1); //~ ERROR arguments to this function are incorrect
+    permuted(Y {}, Z {}, X {}); //~ ERROR arguments to this function are incorrect
+
+    let closure = |x| x;
+    closure(); //~ ERROR function takes
+}