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Sidestep warning about repeated E0005 span_err! invocation.

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Fixes #27279
This commit is contained in:
mitaa 2015-07-26 00:01:28 +02:00
parent adfdbc4bd7
commit 19512be113
1 changed files with 19 additions and 12 deletions
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31
src/librustc/middle/check_match.rs
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@ -1016,12 +1016,8 @@ pub fn specialize<'a>(cx: &MatchCheckCtxt, r: &[&'a Pat],
fn check_local(cx: &mut MatchCheckCtxt, loc: &ast::Local) {
visit::walk_local(cx, loc);
let mut static_inliner = StaticInliner::new(cx.tcx, None);
is_refutable(cx, &*static_inliner.fold_pat(loc.pat.clone()), |pat| {
span_err!(cx.tcx.sess, loc.pat.span, E0005,
"refutable pattern in local binding: `{}` not covered", pat_to_string(pat)
);
});
let pat = StaticInliner::new(cx.tcx, None).fold_pat(loc.pat.clone());
check_irrefutable(cx, &pat, false);
// Check legality of move bindings and `@` patterns.
check_legality_of_move_bindings(cx, false, slice::ref_slice(&loc.pat));
@ -1042,17 +1038,28 @@ fn check_fn(cx: &mut MatchCheckCtxt,
visit::walk_fn(cx, kind, decl, body, sp);
for input in &decl.inputs {
is_refutable(cx, &*input.pat, |pat| {
span_err!(cx.tcx.sess, input.pat.span, E0005,
"refutable pattern in function argument: `{}` not covered",
pat_to_string(pat)
);
});
check_irrefutable(cx, &input.pat, true);
check_legality_of_move_bindings(cx, false, slice::ref_slice(&input.pat));
check_legality_of_bindings_in_at_patterns(cx, &*input.pat);
}
}
fn check_irrefutable(cx: &MatchCheckCtxt, pat: &Pat, is_fn_arg: bool) {
let origin = if is_fn_arg {
"function argument"
} else {
"local binding"
};
is_refutable(cx, pat, |uncovered_pat| {
span_err!(cx.tcx.sess, pat.span, E0005,
"refutable pattern in {}: `{}` not covered",
origin,
pat_to_string(uncovered_pat),
);
});
}
fn is_refutable<A, F>(cx: &MatchCheckCtxt, pat: &Pat, refutable: F) -> Option<A> where
F: FnOnce(&Pat) -> A,
{