use syntax::parse::token::ident_interner;
use syntax::parse::token::special_idents;
use syntax::print::pprust::path_to_str;
-use syntax::codemap::{span, dummy_sp};
+use syntax::codemap::{span, dummy_sp, BytePos};
use syntax::visit::{default_visitor, mk_vt, Visitor, visit_block};
use syntax::visit::{visit_crate, visit_expr, visit_expr_opt};
use syntax::visit::{visit_foreign_item, visit_item};
TypeNS,
name_search_type) {
Failed => {
+ let segment_name = self.session.str_of(name);
+ let module_name = self.module_to_str(search_module);
+ if module_name == ~"???" {
+ self.session.span_err(span {lo: span.lo, hi: span.lo +
+ BytePos(str::len(*segment_name)), expn_info:
+ span.expn_info}, fmt!("unresolved import. perhaps \
+ you forgot an 'extern mod %s'?",
+ *segment_name));
+ return Failed;
+ }
self.session.span_err(span, ~"unresolved name");
return Failed;
}