Add test/async/dont-block-start.wast

Author: lukewagner

test/async/dont-block-start.wast

@@ -0,0 +1,21 @@
+(component definition $C
+  (core module $Memory (memory (export "mem") 1))
+  (core instance $memory (instantiate $Memory))
+  (core module $M
+    (import "" "waitable-set.new" (func $waitable-set.new (result i32)))
+    (import "" "waitable-set.wait" (func $waitable-set.wait (param i32 i32) (result i32)))
+    (func $start
+      (drop (call $waitable-set.wait (call $waitable-set.new) (i32.const 0)))
+    )
+    (start $start)
+  )
+  (canon waitable-set.new (core func $waitable-set.new))
+  (canon waitable-set.wait (memory $memory "mem") (core func $waitable-set.wait))
+  (core instance $m (instantiate $M (with "" (instance
+    (export "waitable-set.new" (func $waitable-set.new))
+    (export "waitable-set.wait" (func $waitable-set.wait))
+  ))))
+)
+;; ideally we'd write (assert_trap (component instance $i $C)), but for now this test
+;; just exit with a trap, but not panic.
+(component instance $i $C)