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diff --git a/test/lit/passes/optimize-instructions-gc.wast b/test/lit/passes/optimize-instructions-gc.wast
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+;; NOTE: Assertions have been generated by update_lit_checks.py and should not be edited.
+;; RUN: wasm-opt %s --optimize-instructions --enable-reference-types --enable-gc -S -o - \
+;; RUN: | filecheck %s
+
+(module
+ ;; These functions test if an `if` with subtyped arms is correctly folded
+ ;; 1. if its `ifTrue` and `ifFalse` arms are identical (can fold)
+ ;; CHECK: (func $if-arms-subtype-fold (result anyref)
+ ;; CHECK-NEXT: (ref.null extern)
+ ;; CHECK-NEXT: )
+ (func $if-arms-subtype-fold (result anyref)
+ (if (result anyref)
+ (i32.const 0)
+ (ref.null extern)
+ (ref.null extern)
+ )
+ )
+ ;; 2. if its `ifTrue` and `ifFalse` arms are not identical (cannot fold)
+ ;; CHECK: (func $if-arms-subtype-nofold (result anyref)
+ ;; CHECK-NEXT: (if (result anyref)
+ ;; CHECK-NEXT: (i32.const 0)
+ ;; CHECK-NEXT: (ref.null extern)
+ ;; CHECK-NEXT: (ref.null func)
+ ;; CHECK-NEXT: )
+ ;; CHECK-NEXT: )
+ (func $if-arms-subtype-nofold (result anyref)
+ (if (result anyref)
+ (i32.const 0)
+ (ref.null extern)
+ (ref.null func)
+ )
+ )
+)