rustc: Give a hint when a static method call has fewer than expected type parameters

In this case, it's likely to be that the user forgot the `self` type, so
say so.

Closes #4096

1 files changed, 22 insertions, 0 deletions

diff --git a/src/test/compile-fail/issue-4096.rs b/src/test/compile-fail/issue-4096.rs
new file mode 100644
index 00000000000..3f1172b6de8
--- /dev/null
+++ b/src/test/compile-fail/issue-4096.rs
@@ -0,0 +1,22 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+pub trait Nummy {
+    fn from_inty<T>() -> Self;
+}
+
+impl Nummy for float {
+    fn from_inty<T>() -> float { 0.0 }
+}
+
+fn main() {
+    let _1:float = Nummy::from_inty::<int>();  //~ ERROR not enough type
+    //~^ NOTE Static methods have an extra implicit type parameter
+}