Explain why a closure is FnOnce in closure errors

2017-05-24 17:30:27 +01:00 · 2017-05-24 17:30:27 +01:00 · bf25b5eb82
commit bf25b5eb82
parent 7748bc665d
1 changed files with 3 additions and 0 deletions
--- a/src/librustc_borrowck/borrowck/mod.rs
+++ b/src/librustc_borrowck/borrowck/mod.rs
@ -597,6 +597,9 @@ impl<'a, 'tcx> BorrowckCtxt<'a, 'tcx> {
                        if let Ok(ty::ClosureKind::FnOnce) =
                           ty::queries::closure_kind::try_get(self.tcx, DUMMY_SP, id) {
                            err.help("closure was moved because it only implements `FnOnce`");
+                            if let Some(&(_kind, Some(span))) = self.tables.closure_kinds.get( ) {
+                                err.span_label(span, "move occured here");
+                            }
                            false
                        } else {
                            true