added test case

Author: Kivooeo

tests/ui/not-enough-arguments.rs

@@ -26,6 +26,13 @@ macro_rules! delegate_local {
     };
 }
 
+macro_rules! delegate_from {
+    ($from:ident, $method:ident) => {
+        <$from>::$method(8)
+        //~^ ERROR function takes 2 arguments but 1
+    };
+}
+
 struct Bar;
 
 impl Bar {
@@ -34,6 +41,7 @@ impl Bar {
         delegate_local!(foo);
         delegate!(foo);
         //~^ ERROR function takes 2 arguments but 1
+        delegate_from!(Bar, foo);
     }
 }
 

tests/ui/not-enough-arguments.stderr

@@ -8,7 +8,7 @@ LL |         delegate_local!(foo);
    |         -------------------- in this macro invocation
    |
 note: associated function defined here
-  --> $DIR/not-enough-arguments.rs:32:8
+  --> $DIR/not-enough-arguments.rs:39:8
    |
 LL |     fn foo(a: u8, b: u8) {}
    |        ^^^        -----
@@ -19,20 +19,40 @@ LL |         <Self>::$method(8, /* u8 */)
    |                          ++++++++++
 
 error[E0061]: this function takes 2 arguments but 1 argument was supplied
-  --> $DIR/not-enough-arguments.rs:35:9
+  --> $DIR/not-enough-arguments.rs:42:9
    |
 LL |         delegate!(foo);
    |         ^^^^^^^^^^^^^^ argument #2 of type `u8` is missing
    |
 note: associated function defined here
-  --> $DIR/not-enough-arguments.rs:32:8
+  --> $DIR/not-enough-arguments.rs:39:8
    |
 LL |     fn foo(a: u8, b: u8) {}
    |        ^^^        -----
    = note: this error originates in the macro `delegate` (in Nightly builds, run with -Z macro-backtrace for more info)
 
+error[E0061]: this function takes 2 arguments but 1 argument was supplied
+  --> $DIR/not-enough-arguments.rs:31:9
+   |
+LL |         <$from>::$method(8)
+   |         ^^^^^^^^^^^^^^^^--- argument #2 of type `u8` is missing
+...
+LL |         delegate_from!(Bar, foo);
+   |         ------------------------ in this macro invocation
+   |
+note: associated function defined here
+  --> $DIR/not-enough-arguments.rs:39:8
+   |
+LL |     fn foo(a: u8, b: u8) {}
+   |        ^^^        -----
+   = note: this error originates in the macro `delegate_from` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: provide the argument
+   |
+LL |         <$from>::$method(8, /* u8 */)
+   |                           ++++++++++
+
 error[E0061]: this function takes 4 arguments but 3 arguments were supplied
-  --> $DIR/not-enough-arguments.rs:41:5
+  --> $DIR/not-enough-arguments.rs:49:5
    |
 LL |     foo(1, 2, 3);
    |     ^^^--------- argument #4 of type `isize` is missing
@@ -48,7 +68,7 @@ LL |     foo(1, 2, 3, /* isize */);
    |                +++++++++++++
 
 error[E0061]: this function takes 6 arguments but 3 arguments were supplied
-  --> $DIR/not-enough-arguments.rs:43:5
+  --> $DIR/not-enough-arguments.rs:51:5
    |
 LL |     bar(1, 2, 3);
    |     ^^^--------- three arguments of type `i32`, `i32`, and `i32` are missing
@@ -63,6 +83,6 @@ help: provide the arguments
 LL |     bar(1, 2, 3, /* i32 */, /* i32 */, /* i32 */);
    |                +++++++++++++++++++++++++++++++++
 
-error: aborting due to 4 previous errors
+error: aborting due to 5 previous errors
 
 For more information about this error, try `rustc --explain E0061`.