Fix if else JS printing when if body is a labelled block (#2017)

Before, we'd print

if (..) label: { .. }; else ..

But that is wrong, as it ends the if too early. After this, we print

if (..) label: { .. } else ..

The bug was we checked if the if body was a block, but not if it was a labelled block.

1 files changed, 21 insertions, 0 deletions

diff --git a/test/wasm2js/if_unreachable.wast b/test/wasm2js/if_unreachable.wast
new file mode 100644
index 000000000..11b41d16e
--- /dev/null
+++ b/test/wasm2js/if_unreachable.wast
@@ -0,0 +1,21 @@
+(module
+ (type $0 (func (param i32 i32 i32 i32 i32 i32)))
+ (import "env" "table" (table $timport$0 6 funcref))
+ (func $0 (; 0 ;) (type $0) (param $0 i32) (param $1 i32) (param $2 i32) (param $3 i32) (param $4 i32) (param $5 i32)
+  (if
+   (i32.ne
+    (i32.const 0)
+    (i32.const 48)
+   )
+   (block $label$2
+    (br_if $label$2
+     (i32.const 0)
+    )
+    (unreachable)
+   )
+   (unreachable)
+  )
+  (unreachable)
+ )
+)
+