Fix scope stack staying broken after a yield in strict mode (#105)

* Fix scope stack staying broken after a yield in strict mode

* Warn on a yield in strict mode instead of cancelling the thread

* Fix type error when an effect errors outside strict mode

test/tests.luau

@@ -3146,7 +3146,7 @@ end))
 TEST("strict", wrap_root(function()
     vide.strict = true
 
-    do CASE "error on derived callback yield"
+    do CASE "warn on derived callback yield"
         local src = source(1)
 
         local ok = pcall(function()
@@ -3156,10 +3156,10 @@ TEST("strict", wrap_root(function()
             end)
         end)
 
-        CHECK(not ok)
+        CHECK(ok)
     end
 
-    do CASE "error on effecter callback yield"
+    do CASE "warn on effecter callback yield"
         local src = source(1)
 
         local ok = pcall(function()
@@ -3169,7 +3169,28 @@ TEST("strict", wrap_root(function()
             end)
         end)
 
-        CHECK(not ok)
+        CHECK(ok)
+    end
+
+    do CASE "yield in a component"
+        local input = source(false)
+        local thread
+        local output
+
+        local destroy = root(function()
+            output = show(input, function()
+                thread = coroutine.running()
+                coroutine.yield()
+                return "component"
+            end)
+        end)
+
+        CHECK((pcall(input, true)))
+        CHECK(output() == nil)
+        CHECK((coroutine.resume(thread)))
+        CHECK(output() == "component")
+        CHECK(pcall(input, false))
+        CHECK(pcall(destroy))
     end
 
     do CASE "run derived callback twice"