/// Returns span for the macro which originally caused the current expansion to happen.
///
/// Stops backtracing at include! boundary.
- pub fn expansion_cause(&self) -> Span {
+ pub fn expansion_cause(&self) -> Option<Span> {
let mut ctxt = self.backtrace();
let mut last_macro = None;
loop {
break
}
}
- last_macro.expect("missing expansion backtrace")
+ last_macro
}
pub fn struct_span_warn(&self,
-> Box<base::MacResult+'static> {
base::check_zero_tts(cx, sp, tts, "line!");
- let topmost = cx.expansion_cause();
+ let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.codemap().lookup_char_pos(topmost.lo);
base::MacEager::expr(cx.expr_u32(topmost, loc.line as u32))
-> Box<base::MacResult+'static> {
base::check_zero_tts(cx, sp, tts, "column!");
- let topmost = cx.expansion_cause();
+ let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.codemap().lookup_char_pos(topmost.lo);
base::MacEager::expr(cx.expr_u32(topmost, loc.col.to_usize() as u32))
-> Box<base::MacResult+'static> {
base::check_zero_tts(cx, sp, tts, "file!");
- let topmost = cx.expansion_cause();
+ let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.codemap().lookup_char_pos(topmost.lo);
base::MacEager::expr(cx.expr_str(topmost, Symbol::intern(&loc.file.name)))
}
--- /dev/null
+// Copyright 2017 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.
+
+fn main() {
+ include!(line!()); //~ ERROR argument must be a string literal
+}