diff --git a/shared/src/test/diff/codegen/NewMatching.mls b/shared/src/test/diff/codegen/NewMatching.mls
index 397797ab7..50d2dbc1d 100644
--- a/shared/src/test/diff/codegen/NewMatching.mls
+++ b/shared/src/test/diff/codegen/NewMatching.mls
@@ -42,7 +42,7 @@ fun sum(v) =
 //│     return (a = v, a instanceof V0.class ? 0 : a instanceof V1.class ? (([a]) => a)(V1.unapply(v)) : a instanceof V2.class ? (([
 //│       a,
 //│       b
-//│     ]) => a + b)(V2.unapply(v)) : a instanceof Pos.class ? (([x]) => x > 0 === true ? x : 0 - 1)(Pos.unapply(v)) : a instanceof V22.class ? (([
+//│     ]) => a + b)(V2.unapply(v)) : a instanceof Pos.class ? (([x]) => x > 0 === true ? x : -1)(Pos.unapply(v)) : a instanceof V22.class ? (([
 //│       tmp0,
 //│       tmp1
 //│     ]) => tmp0 instanceof V2.class ? (([
@@ -51,10 +51,10 @@ fun sum(v) =
 //│     ]) => tmp1 instanceof V2.class ? (([
 //│       x2,
 //│       y2
-//│     ]) => x1 + y1 + x2 + y2)(V2.unapply(tmp1)) : 0 - 1)(V2.unapply(tmp0)) : 0 - 1)(V22.unapply(v)) : a instanceof Half.class ? (([
+//│     ]) => x1 + y1 + x2 + y2)(V2.unapply(tmp1)) : -1)(V2.unapply(tmp0)) : -1)(V22.unapply(v)) : a instanceof Half.class ? (([
 //│       tmp2,
 //│       x
-//│     ]) => x)(Half.unapply(v)) : a instanceof None.class ? (([tmp3]) => 0)(None.unapply(v)) : 0 - 1);
+//│     ]) => x)(Half.unapply(v)) : a instanceof None.class ? (([tmp3]) => 0)(None.unapply(v)) : -1);
 //│   })());
 //│ };
 //│ // End of generated code
diff --git a/shared/src/test/diff/nu/UnaryMinus.mls b/shared/src/test/diff/nu/UnaryMinus.mls
index 389426bfe..bb0341d0a 100644
--- a/shared/src/test/diff/nu/UnaryMinus.mls
+++ b/shared/src/test/diff/nu/UnaryMinus.mls
@@ -28,7 +28,7 @@
 1 - (3 - 5)
 //│ Int
 //│ res
-//│     = -7
+//│     = 3
 
 3 - 1
 //│ Int
@@ -53,7 +53,7 @@
 1 - (1 - 1)
 //│ Int
 //│ res
-//│     = -1
+//│     = 1
 
 1 - 1
 //│ Int
diff --git a/shared/src/test/diff/parser/NegativeLits.mls b/shared/src/test/diff/parser/NegativeLits.mls
index 0f3cc42b3..4290b760b 100644
--- a/shared/src/test/diff/parser/NegativeLits.mls
+++ b/shared/src/test/diff/parser/NegativeLits.mls
@@ -1,7 +1,6 @@
 :NewParser
 :ParseOnly
 
-:e // FIXME: What does this test represent?
 type MinusOne = -1
 //│ |#type| |MinusOne| |#=| |-|1|
 //│ Parsed: {type alias MinusOne: -1 {}}