Wrong codegen for generic foreign functions.

[pravic]

rustc 1.7.0 (a5d1e7a 2016-02-29) (32-bit GNU)
rustc 1.9.0-nightly (b12b4e4 2016-03-17) (32-bit MSVC)

#![allow(dead_code, unused_variables)]

extern "stdcall" fn foo_s(a: i32, _: i32, _: i32, _: i32, _: i32) {
    println!("foo_s<>{:?}", a);
}

extern "stdcall" fn bar_s<T>(a: i32, _: i32, _: i32, _: i32, _: i32) {
    println!("foo_s<T>{:?}", a);
}

struct FooHandler { me: i32, }

impl FooHandler {
    pub extern "stdcall" fn foo_s(a: i32, _: i32, _: i32, _: i32, _: i32) {
        println!("FooHandler::foo_s<>{:?}", a);
    }

    // this function does not following stdcall:
    pub extern "stdcall" fn bar_s_bug<T>(a: i32, _: i32, _: i32, _: i32, _: i32) {
        println!("FooHandler::bar_s<>{:?}", a);
    }
}

fn main() {
    let a = foo_s;
    let b = bar_s::<FooHandler>;

    let e = FooHandler::foo_s;
    let f = FooHandler::bar_s_bug::<FooHandler>;

    a(1, 0, 0, 0, 0);   // ok
    b(2, 0, 0, 0, 0);   // ok
    e(5, 0, 0, 0, 0);   // ok
    f(6, 0, 0, 0, 0);   // not stdcall.
}

[eddyb]

This was fixed by #32080, impl methods' ABIs were previously completely ignored.

[pravic]

Yes, rustc 1.9.0-nightly (21922e1 2016-03-21) (32-bit MSVC) is working fine.
Thanks.

[eddyb]

I'd like this open to make sure a test ends up being written.