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Oops, hide 'unless once fn' error message hint behind -Z once-fns too.

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This commit is contained in:
Ben Blum 2013-06-19 16:03:31 -04:00
parent 643be38cfe
commit 3ba8404c88
1 changed files with 6 additions and 3 deletions
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9
src/librustc/middle/borrowck/gather_loans/gather_moves.rs
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@ -115,11 +115,14 @@ fn check_is_legal_to_move_from(bccx: @BorrowckCtxt,
// These are separate from the above cases for a better error message.
mc::cat_stack_upvar(*) |
mc::cat_copied_upvar(mc::CopiedUpvar { onceness: ast::Many, _ }) => {
let once_hint = if bccx.tcx.sess.once_fns() {
" (unless the destination closure type is `once fn')"
} else {
""
};
bccx.span_err(
cmt0.span,
fmt!("cannot move out of %s \
(unless the destination closure type is `once fn')",
bccx.cmt_to_str(cmt)));
fmt!("cannot move out of %s%s", bccx.cmt_to_str(cmt), once_hint));
false
}