Hack!

See AssemblyScript#2594 (comment).

Author: CountBleck

src/compiler.ts

@@ -397,6 +397,7 @@ export class Compiler extends DiagnosticEmitter {
 
   /** Program reference. */
   program: Program;
+  static breakingFlowAlternatives: Flow | null = null;
   /** Module instance being compiled. */
   get module(): Module { return this.program.module; }
   /** Provided options. */
@@ -2831,7 +2832,10 @@ export class Compiler extends DiagnosticEmitter {
       // Combine all alternatives that merge again with outer flow
       if (possiblyBreaks || (isLast && possiblyFallsThrough)) {
         if (breakingFlowAlternatives) breakingFlowAlternatives.inheritAlternatives(breakingFlowAlternatives, innerFlow);
-        else breakingFlowAlternatives = innerFlow;
+        else {
+          breakingFlowAlternatives = innerFlow;
+          Compiler.breakingFlowAlternatives = breakingFlowAlternatives;
+        }
 
       // Otherwise just merge the effects of a non-merging branch
       } else if (!possiblyFallsThrough) {