ICE: "no path elem for NodeStmt(Spanned ..." (UFCS related)

[japaric]

Found while filling issue #18501

STR

// fmt.rs
struct Foo;
// This is the ICE trigger
struct Formatter;

trait Show {
    fn fmt(&self);
}

impl Show for Foo {
    fn fmt(&self) {}
}

fn bar<T>(f: extern "Rust" fn(&T), t: &T) {}

// ICE requirement: this has to be marked as inline
#[inline]
pub fn baz() {
    bar(Show::fmt, &Foo);
}

// main.rs
extern crate fmt;

fn main() {
    ::fmt::baz();
}

Output

$ rustc --crate-type=lib fmt.rs && rustc -L . main.rs
task 'rustc' panicked at 'no path elem for NodeStmt(Spanned { node: StmtSemi(Expr { id: 10, node: ExprCall(Expr { id: 11, node: ExprPath(Path { span: Span { lo: BytePos(46), hi: BytePos(56), expn_id: ExpnId(4294967295) }, global: true, segments: [PathSegment { identifier: "fmt"(60)#0, lifetimes: [], types: OwnedSlice {{}} }, PathSegment { identifier: "baz"(62)#0, lifetimes: [], types: OwnedSlice {{}} }] }), span: Span { lo: BytePos(46), hi: BytePos(56), expn_id: ExpnId(4294967295) } }, []), span: Span { lo: BytePos(46), hi: BytePos(58), expn_id: ExpnId(4294967295) } }, 9), span: Span { lo: BytePos(46), hi: BytePos(59), expn_id: ExpnId(4294967295) } })', /var/tmp/paludis/build/dev-lang-rust-scm/work/rust-scm/src/libsyntax/ast_map/mod.rs:411

I couldn't get a backtrace with RUST_BACKTRACE nor with gdb

Version

rustc 0.13.0-dev (82045ca36 2014-10-31 11:16:44 +0000)

cc @nick29581

[Manishearth]

Note: the breakpoint is now rust_panic, not rust_fail

[bkoropoff]

This seems to be the same underlying problem as #18501 and is fixed by the fix for that issue.