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-rw-r--r--ext/stringio/stringio.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index 25122dd1b5..14611a77f7 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -32,6 +32,7 @@ static struct StringIO* check_strio _((VALUE));
static struct StringIO* get_strio _((VALUE));
static struct StringIO* readable _((struct StringIO *));
static struct StringIO* writable _((struct StringIO *));
+static struct void check_modifiable _((struct StringIO *));
#define IS_STRIO(obj) (RDATA(obj)->dmark == (RUBY_DATA_FUNC)strio_mark)
#define error_inval(msg) (errno = EINVAL, rb_sys_fail(msg))
@@ -117,7 +118,7 @@ writable(ptr)
return ptr;
}
-static struct StringIO*
+static struct void
check_modifiable(ptr)
struct StringIO *ptr;
{