Rollup merge of rust-lang#35983 - GuillaumeGomez:e0060_bonus, r=jonathandturner

E0060 and E0061 improvement

Fixes rust-lang#35290.

r? @jonathandturner

Author: Manishearth

src/librustc_typeck/check/mod.rs

@@ -2466,16 +2466,18 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
                     if arg_count == 1 {" was"} else {"s were"}),
                 error_code);
 
-            err.span_label(sp, &format!("expected {}{} parameter{}",
-                                        if variadic {"at least "} else {""},
-                                        expected_count,
-                                        if expected_count == 1 {""} else {"s"}));
-
             let input_types = fn_inputs.iter().map(|i| format!("{:?}", i)).collect::<Vec<String>>();
-            if input_types.len() > 0 {
-                err.note(&format!("the following parameter type{} expected: {}",
-                        if expected_count == 1 {" was"} else {"s were"},
-                        input_types.join(", ")));
+            if input_types.len() > 1 {
+                err.note("the following parameter types were expected:");
+                err.note(&input_types.join(", "));
+            } else if input_types.len() > 0 {
+                err.note(&format!("the following parameter type was expected: {}",
+                                  input_types[0]));
+            } else {
+                err.span_label(sp, &format!("expected {}{} parameter{}",
+                                            if variadic {"at least "} else {""},
+                                            expected_count,
+                                            if expected_count == 1 {""} else {"s"}));
             }
             err.emit();
         }

src/test/compile-fail/E0060.rs

@@ -15,6 +15,5 @@ extern "C" {
 fn main() {
     unsafe { printf(); }
     //~^ ERROR E0060
-    //~| NOTE expected at least 1 parameter
-    //~| NOTE the following parameter type was expected
+    //~| NOTE the following parameter type was expected: *const u8
 }

src/test/compile-fail/E0061.rs

@@ -10,9 +10,15 @@
 
 fn f(a: u16, b: &str) {}
 
+fn f2(a: u16) {}
+
 fn main() {
     f(0);
     //~^ ERROR E0061
-    //~| NOTE expected 2 parameters
-    //~| NOTE the following parameter types were expected
+    //~| NOTE the following parameter types were expected:
+    //~| NOTE u16, &str
+
+    f2();
+    //~^ ERROR E0061
+    //~| NOTE the following parameter type was expected: u16
 }

src/test/compile-fail/issue-18819.rs

@@ -25,6 +25,6 @@ fn print_x(_: &Foo<Item=bool>, extra: &str) {
 fn main() {
     print_x(X);
     //~^ ERROR this function takes 2 parameters but 1 parameter was supplied
-    //~| NOTE the following parameter types were expected: &Foo<Item=bool>, &str
-    //~| NOTE expected 2 parameters
+    //~| NOTE the following parameter types were expected:
+    //~| NOTE &Foo<Item=bool>, &str
 }

src/test/compile-fail/issue-3044.rs

@@ -15,6 +15,6 @@ fn main() {
     });
     //~^^ ERROR this function takes 2 parameters but 1 parameter was supplied
     //~| NOTE the following parameter types were expected
-    //~| NOTE expected 2 parameters
+    //~| NOTE _, _
     // the first error is, um, non-ideal.
 }

src/test/compile-fail/issue-4935.rs

@@ -14,4 +14,3 @@ fn foo(a: usize) {}
 fn main() { foo(5, 6) }
 //~^ ERROR this function takes 1 parameter but 2 parameters were supplied
 //~| NOTE the following parameter type was expected
-//~| NOTE expected 1 parameter

src/test/compile-fail/method-call-err-msg.rs

@@ -23,10 +23,9 @@ fn main() {
      //~^ NOTE expected 0 parameters
      .one()     //~ ERROR this function takes 1 parameter but 0 parameters were supplied
      //~^ NOTE the following parameter type was expected
-     //~| NOTE expected 1 parameter
      .two(0);   //~ ERROR this function takes 2 parameters but 1 parameter was supplied
      //~^ NOTE the following parameter types were expected
-     //~| NOTE expected 2 parameters
+     //~| NOTE isize, isize
 
     let y = Foo;
     y.zero()

src/test/compile-fail/not-enough-arguments.rs

@@ -19,6 +19,6 @@ fn foo(a: isize, b: isize, c: isize, d:isize) {
 fn main() {
   foo(1, 2, 3);
   //~^ ERROR this function takes 4 parameters but 3
-  //~| NOTE the following parameter types were expected
-  //~| NOTE expected 4 parameters
+  //~| NOTE the following parameter types were expected:
+  //~| NOTE isize, isize, isize, isize
 }

src/test/compile-fail/overloaded-calls-bad.rs

@@ -42,9 +42,7 @@ fn main() {
     let ans = s();
     //~^ ERROR this function takes 1 parameter but 0 parameters were supplied
     //~| NOTE the following parameter type was expected
-    //~| NOTE expected 1 parameter
     let ans = s("burma", "shave");
     //~^ ERROR this function takes 1 parameter but 2 parameters were supplied
     //~| NOTE the following parameter type was expected
-    //~| NOTE expected 1 parameter
 }

src/test/compile-fail/variadic-ffi-3.rs

@@ -17,11 +17,11 @@ extern "C" fn bar(f: isize, x: u8) {}
 fn main() {
     unsafe {
         foo(); //~ ERROR: this function takes at least 2 parameters but 0 parameters were supplied
-        //~^ NOTE the following parameter types were expected
-        //~| NOTE expected at least 2 parameters
+               //~^ NOTE the following parameter types were expected:
+               //~| NOTE isize, u8
         foo(1); //~ ERROR: this function takes at least 2 parameters but 1 parameter was supplied
-        //~^ NOTE the following parameter types were expected
-        //~| NOTE expected at least 2 parameters
+        //~^ NOTE the following parameter types were expected:
+        //~| NOTE isize, u8
 
         let x: unsafe extern "C" fn(f: isize, x: u8) = foo;
         //~^ ERROR: mismatched types