diff --git a/compiler/rl_dump.m b/compiler/rl_dump.m
index 9918f6561..e627cc96f 100644
--- a/compiler/rl_dump.m
+++ b/compiler/rl_dump.m
@@ -181,10 +181,10 @@ rl_dump__write_instruction(_ModuleInfo, RelationInfo,
 	union_diff(Union, Input1, Input2, Diff, Index, CopyInfo) - Comment) -->
 
 	rl_dump__write_output_rel(RelationInfo, Diff),
-	comma,
-	rl_dump__write_relation_id(RelationInfo, Union),
 	io__write_string(" = union_diff("),
 	rl_dump__write_relation_id(RelationInfo, Input1),
+	io__write_string(" => "),
+	rl_dump__write_relation_id(RelationInfo, Union),
 	comma,
 	rl_dump__write_relation_id(RelationInfo, Input2),
 	comma,
@@ -197,9 +197,10 @@ rl_dump__write_instruction(_ModuleInfo, RelationInfo,
 
 rl_dump__write_instruction(ModuleInfo, RelationInfo,
 		insert(UoOutput, DiInput, Input, Type, CopyInfo) - Comment) -->
-	rl_dump__write_relation_id(RelationInfo, UoOutput),
-	io__write_string(" = insert("),
+	io__write_string("insert("),
 	rl_dump__write_relation_id(RelationInfo, DiInput),
+	io__write_string(" => "),
+	rl_dump__write_relation_id(RelationInfo, UoOutput),
 	comma,
 	rl_dump__write_relation_id(RelationInfo, Input),
 	comma,