From aaca617dea0adc0ce5cc535ac969bb8e123ba9ca Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 26 Jul 2026 11:55:32 +0100
Subject: Remove duplication of mapping error to InvalidData

---
 .../rusttransient0/RustTransient0Generator.java       | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java
index 6f8de50..3718f05 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java
@@ -898,7 +898,7 @@ public class RustTransient0Generator implements Generator {
                 new RustBlockExpression(
                     List.of(),
                     Optional.of(
-                        new RustTryPropagationExpression(mapErr(
+                        new RustTryPropagationExpression(mapErrToInvalidData(
                             methodCall(
                                 new RustCallExpression(
                                     RustTypes.ARC.addSegment(RustPathSegment.of("clone")),
@@ -913,13 +913,7 @@ public class RustTransient0Generator implements Generator {
                                 RustIdentifier.of("downcast"),
                                 List.of()
                             ),
-                            _ -> new RustCallExpression(
-                                RustPath.global("std", "io", "Error", "new"),
-                                List.of(
-                                    RustPath.global("std", "io", "ErrorKind", "InvalidData"),
-                                    new RustStringLiteral("referenced value has wrong type")
-                                )
-                            )
+                            _ -> new RustStringLiteral("referenced value has wrong type")
                         ))
                     )
                 ),
@@ -1066,13 +1060,20 @@ public class RustTransient0Generator implements Generator {
     }
 
     private RustExpression mapErrToInvalidData(RustExpression result) {
+        return mapErrToInvalidData(result, error -> RustPath.of(error));
+    }
+
+    private RustExpression mapErrToInvalidData(
+        RustExpression result,
+        Function<RustIdentifier, RustExpression> createSubError
+    ) {
         return mapErr(
             result,
             error -> new RustCallExpression(
                 RustPath.global("std", "io", "Error", "new"),
                 List.of(
                     RustPath.global("std", "io", "ErrorKind", "InvalidData"),
-                    RustPath.of(error)
+                    createSubError.apply(error)
                 )
             )
         );
-- 
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