diff options
author | Russ Cox <rsc@golang.org> | 2012-02-06 12:35:29 -0500 |
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committer | Russ Cox <rsc@golang.org> | 2012-02-06 12:35:29 -0500 |
commit | 74ee51ee92d35ccc6486b9126265bd2c62be2c3f (patch) | |
tree | e6ae64b5e543989a3cc2a505ae456d530a12581e | |
parent | 98257750f483238f2895d6077bf42e7c91cd8f3d (diff) | |
download | go-74ee51ee92d35ccc6486b9126265bd2c62be2c3f.tar.gz go-74ee51ee92d35ccc6486b9126265bd2c62be2c3f.zip |
cmd/gc: disallow switch _ := v.(type)
Fixes #2827.
R=ken2
CC=golang-dev
https://golang.org/cl/5638045
-rw-r--r-- | src/cmd/gc/go.y | 2 | ||||
-rw-r--r-- | src/cmd/gc/y.tab.c | 2 | ||||
-rw-r--r-- | test/typeswitch3.go | 4 |
3 files changed, 6 insertions, 2 deletions
diff --git a/src/cmd/gc/go.y b/src/cmd/gc/go.y index c44aabf398..3190963587 100644 --- a/src/cmd/gc/go.y +++ b/src/cmd/gc/go.y @@ -423,7 +423,7 @@ simple_stmt: yyerror("expr.(type) must be alone in list"); if($1->next != nil) yyerror("argument count mismatch: %d = %d", count($1), 1); - else if($1->n->op != ONAME && $1->n->op != OTYPE && $1->n->op != ONONAME) + else if(($1->n->op != ONAME && $1->n->op != OTYPE && $1->n->op != ONONAME) || isblank($1->n)) yyerror("invalid variable name %N in type switch", $1->n); else $$->left = dclname($1->n->sym); // it's a colas, so must not re-use an oldname. diff --git a/src/cmd/gc/y.tab.c b/src/cmd/gc/y.tab.c index 9bf1019e9d..2ad3d89b34 100644 --- a/src/cmd/gc/y.tab.c +++ b/src/cmd/gc/y.tab.c @@ -2714,7 +2714,7 @@ yyreduce: yyerror("expr.(type) must be alone in list"); if((yyvsp[(1) - (3)].list)->next != nil) yyerror("argument count mismatch: %d = %d", count((yyvsp[(1) - (3)].list)), 1); - else if((yyvsp[(1) - (3)].list)->n->op != ONAME && (yyvsp[(1) - (3)].list)->n->op != OTYPE && (yyvsp[(1) - (3)].list)->n->op != ONONAME) + else if(((yyvsp[(1) - (3)].list)->n->op != ONAME && (yyvsp[(1) - (3)].list)->n->op != OTYPE && (yyvsp[(1) - (3)].list)->n->op != ONONAME) || isblank((yyvsp[(1) - (3)].list)->n)) yyerror("invalid variable name %N in type switch", (yyvsp[(1) - (3)].list)->n); else (yyval.node)->left = dclname((yyvsp[(1) - (3)].list)->n->sym); // it's a colas, so must not re-use an oldname. diff --git a/test/typeswitch3.go b/test/typeswitch3.go index 078980146f..e11da7d747 100644 --- a/test/typeswitch3.go +++ b/test/typeswitch3.go @@ -30,6 +30,10 @@ func main(){ switch r.(type) { case io.Writer: } + + // Issue 2827. + switch _ := r.(type) { // ERROR "invalid variable name _" + } } |