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Improve an error message a little.

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This commit is contained in:
Paul Stansifer 2012-07-24 11:44:17 -07:00
parent f785cccf0f
commit e20c5e7596
1 changed files with 5 additions and 3 deletions
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8
src/libsyntax/ext/tt/earley_parser.rs
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@ -232,9 +232,11 @@ fn parse(sess: parse_sess, cfg: ast::crate_cfg, rdr: reader, ms: ~[matcher])
if (bb_eis.len() > 0u && next_eis.len() > 0u)
|| bb_eis.len() > 1u {
let nts = str::connect(vec::map(bb_eis, |ei| {
alt ei.elts[ei.idx].node
{ mtc_bb(_,name,_) { *name } _ { fail; } }
}), ~" or ");
alt ei.elts[ei.idx].node {
mtc_bb(bind,name,_) {
#fmt["%s ('%s')", *name, *bind]
}
_ { fail; } } }), ~" or ");
ret failure(sp, #fmt[
"Local ambiguity: multiple parsing options: \
built-in NTs %s or %u other options.",