compiler: Don't crash on erroneous channel reads.

Fixes golang/go#12320. Change-Id: I58f1ef605fc7200319c45f87673198c4c989fd09 Reviewed-on: https://go-review.googlesource.com/13932 Reviewed-by: Ian Lance Taylor <[email protected]>
golang · Sep 16, 2015 · 1cb26dc · 1cb26dc
1 parent 79f457a
commit 1cb26dc
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/go/expressions.cc b/go/expressions.cc
@@ -3472,6 +3472,15 @@ Unsafe_type_conversion_expression::do_get_backend(Translate_context* context)
 
   Type* t = this->type_;
   Type* et = this->expr_->type();
+
+  if (t->is_error_type()
+      || this->expr_->is_error_expression()
+      || et->is_error_type())
+    {
+      go_assert(saw_errors());
+      return context->backend()->error_expression();
+    }
+
   if (t->array_type() != NULL)
     go_assert(et->array_type() != NULL
               && t->is_slice_type() == et->is_slice_type());