diff options
Diffstat (limited to 'src/cmd/gc/select.c')
| -rw-r--r-- | src/cmd/gc/select.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/src/cmd/gc/select.c b/src/cmd/gc/select.c index 9cba01fa5..1a3771311 100644 --- a/src/cmd/gc/select.c +++ b/src/cmd/gc/select.c @@ -41,11 +41,18 @@ typecheckselect(Node *sel) setlineno(n); switch(n->op) { default: - yyerror("select case must be receive, send or assign recv");; + yyerror("select case must be receive, send or assign recv"); break; case OAS: // convert x = <-c into OSELRECV(x, c) + // assignment might have introduced a + // conversion. throw it away. + // it will come back when the select code + // gets generated, because it always assigns + // through a temporary. + if((n->right->op == OCONVNOP || n->right->op == OCONVIFACE) && n->right->implicit) + n->right = n->right->left; if(n->right->op != ORECV) { yyerror("select assignment must have receive on right hand side"); break; @@ -68,8 +75,6 @@ typecheckselect(Node *sel) typechecklist(ncase->nbody, Etop); } sel->xoffset = count; - if(count == 0) - yyerror("empty select"); lineno = lno; } @@ -91,7 +96,7 @@ walkselect(Node *sel) typecheck(&r, Etop); init = list(init, r); - if(sel->list == nil) + if(sel->list == nil && sel->xoffset != 0) fatal("double walkselect"); // already rewrote // register cases |