diff --git a/src/librustc/middle/typeck/check/mod.rs b/src/librustc/middle/typeck/check/mod.rs index e7ef30c4576c4..b7fe565f5cfda 100644 --- a/src/librustc/middle/typeck/check/mod.rs +++ b/src/librustc/middle/typeck/check/mod.rs @@ -3208,10 +3208,19 @@ pub fn instantiate_path(fcx: @mut FnCtxt, ty_param_count, ty_substs_len)); fcx.infcx().next_ty_vars(ty_param_count) } else if ty_substs_len < ty_param_count { + let is_static_method = match fcx.ccx.tcx.def_map.find(&node_id) { + Some(&ast::def_static_method(*)) => true, + _ => false + }; fcx.ccx.tcx.sess.span_err (span, fmt!("not enough type parameters provided: expected %u, found %u", ty_param_count, ty_substs_len)); + if is_static_method { + fcx.ccx.tcx.sess.span_note + (span, "Static methods have an extra implicit type parameter -- \ + did you omit the type parameter for the `Self` type?"); + } fcx.infcx().next_ty_vars(ty_param_count) } else { pth.types.map(|aty| fcx.to_ty(aty)) diff --git a/src/test/compile-fail/issue-4096.rs b/src/test/compile-fail/issue-4096.rs new file mode 100644 index 0000000000000..3f1172b6de8f6 --- /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 or the MIT license +// , at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +pub trait Nummy { + fn from_inty() -> Self; +} + +impl Nummy for float { + fn from_inty() -> float { 0.0 } +} + +fn main() { + let _1:float = Nummy::from_inty::(); //~ ERROR not enough type + //~^ NOTE Static methods have an extra implicit type parameter +}