1 files changed, 69 insertions, 0 deletions
diff --git a/test/spec/shared-struct.wast b/test/spec/shared-struct.wast
new file mode 100644
index 000000000..b2c82caff
--- /dev/null
+++ b/test/spec/shared-struct.wast
@@ -0,0 +1,69 @@
+;; Shared struct declaration syntax
+(module
+  (type (shared (struct)))
+  (type (sub final (shared (struct))))
+  (rec
+    (type (sub final (shared (struct))))
+  )
+
+  (global (ref 0) (struct.new 1))
+  (global (ref 1) (struct.new 2))
+  (global (ref 2) (struct.new 0))
+)
+
+;; Shared structs are distinct from non-shared structs
+(assert_invalid
+  (module
+    (type (shared (struct)))
+    (type (struct))
+
+    (global (ref 0) (struct.new 1))
+  )
+  "not a subtype"
+)
+
+(assert_invalid
+  (module
+    (type (shared (struct)))
+    (type (struct))
+
+    (global (ref 1) (struct.new 0))
+  )
+  "not a subtype"
+)
+
+;; Shared structs may not be subtypes of non-shared structs
+(assert_invalid
+  (module
+    (type (sub (struct)))
+    (type (sub 0 (shared (struct))))
+  )
+  "invalid supertype"
+)
+
+;; Non-shared structs may not be subtypes of shared structs
+(assert_invalid
+  (module
+    (type (sub (shared (struct))))
+    (type (sub 0 (struct)))
+  )
+  "invalid supertype"
+)
+
+;; Shared structs may not contain non-shared references
+(assert_invalid
+  (module
+    (type (shared (struct anyref)))
+  )
+  "invalid field"
+)
+
+;; But they may contain shared references
+(module
+  (type (shared (struct (ref null (shared any)))))
+)
+
+;; Non-shared structs may contain shared references
+(module
+  (type (struct (ref null (shared any))))
+)