bjoernager/rust
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Improve error message for ambiguous polymorphic types

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If a type still contains free type variables after typechecking (for
example, as with "auto foo = []", the result was an assertion failure
in typeck. Made it a human-readable error message instead.
This commit is contained in:
Tim Chevalier 2011-05-23 19:44:04 -07:00
parent 776977b755
commit c9a8bdee2f
1 changed files with 5 additions and 0 deletions
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5
src/comp/middle/typeck.rs
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@ -1570,6 +1570,11 @@ mod writeback {
} }
} }
if (ty::type_contains_vars(fcx.ccx.tcx, local_ty)) {
fcx.ccx.tcx.sess.span_err(sp,
"Ambiguous type " + ty_to_str(fcx.ccx.tcx, local_ty)
+ "\n(Try adding more type annotations.)");
}
write::ty_only(fcx.ccx.tcx, local.ann.id, local_ty); write::ty_only(fcx.ccx.tcx, local.ann.id, local_ty);
} }