nullaway/src/main/java/com/uber/nullaway/NullAway.java [381:391]:
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    TreePath enclosingMethodOrLambda =
        NullabilityUtil.findEnclosingMethodOrLambdaOrInitializer(state.getPath());
    if (enclosingMethodOrLambda == null) {
      throw new RuntimeException("no enclosing method, lambda or initializer!");
    }
    if (!(enclosingMethodOrLambda.getLeaf() instanceof MethodTree
        || enclosingMethodOrLambda.getLeaf() instanceof LambdaExpressionTree)) {
      throw new RuntimeException(
          "return statement outside of a method or lambda! (e.g. in an initializer block)");
    }
    Tree leaf = enclosingMethodOrLambda.getLeaf();
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nullaway/src/main/java/com/uber/nullaway/handlers/StreamNullabilityPropagator.java [528:538]:
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    TreePath enclosingMethodOrLambda =
        NullabilityUtil.findEnclosingMethodOrLambdaOrInitializer(state.getPath());
    if (enclosingMethodOrLambda == null) {
      throw new RuntimeException("no enclosing method, lambda or initializer!");
    }
    if (!(enclosingMethodOrLambda.getLeaf() instanceof MethodTree
        || enclosingMethodOrLambda.getLeaf() instanceof LambdaExpressionTree)) {
      throw new RuntimeException(
          "return statement outside of a method or lambda! (e.g. in an initializer block)");
    }
    Tree leaf = enclosingMethodOrLambda.getLeaf();
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