Missing insert return after pattern matching statement

source/parser/function.civet

@@ -381,7 +381,8 @@ function insertReturn(node: ASTNode, outerNode: ASTNode = node): void
       // if block
       insertReturn(exp.then)
       // else block
-      if (exp.else) insertReturn(exp.else[2])
+      // PatternMatchingStatement generates else blocks of []
+      if (exp.else and exp.else.length !== 0) insertReturn(exp.else[2])
       // Add explicit return after if block if no else block
       else exp.children.push ["", {
         type: "ReturnStatement"

test/examples.civet

@@ -670,7 +670,7 @@ describe "examples (from real life)", ->
     ---
     function foo(a) {
       if (bar[a] === 'three') return 3
-      if (a < 0) return (()=>{let m;if(m = bar[-a],m === 'three') { return 3}})()
+      if (a < 0) return (()=>{let m;if(m = bar[-a],m === 'three') { return 3};return})()
       let ret = 9
       ret *= a
       return ret

test/switch.civet

@@ -336,6 +336,34 @@ describe "switch", ->
     }
   """
 
+  // #1118
+  testCase """
+    break after pattern matching statement
+    ---
+    fn := (x : number) =>
+      switch x
+        when 0
+          num := 10
+          switch num
+            <? "number"
+              return 0
+        when 1
+          return 1
+    ---
+    const fn = (x : number) => {
+      switch(x) {
+        case 0: {
+          const num = 10
+          if(typeof num === "number") {
+              return 0};return
+        }
+        case 1: {
+          return 1
+        }
+      }
+    }
+  """
+
   throws """
     mixed when and pattern matching
     ---