From 152c1dc711f472d3ae441a94aefd7a8b54811ffb Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Thu, 2 Jul 2026 17:24:21 +0100
Subject: Support empty inherent impl in Rust AST

---
 .../compiler/output/lang/rust/RustWriter.java      | 12 ++++++++
 .../output/lang/rust/ast/RustInherentImpl.java     | 32 ++++++++++++++++++++++
 .../compiler/output/lang/rust/ast/RustItem.java    |  2 +-
 3 files changed, 45 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustInherentImpl.java

(limited to 'src/main/java/org')

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriter.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriter.java
index 59b792c..7ab09c7 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriter.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriter.java
@@ -62,6 +62,10 @@ public class RustWriter implements AutoCloseable {
                 writeEnum(enum_);
             }
 
+            case RustInherentImpl inherentImpl -> {
+                writeInherentImpl(inherentImpl);
+            }
+
             case RustStructStruct structStruct -> {
                 writeStructStruct(structStruct);
             }
@@ -107,6 +111,14 @@ public class RustWriter implements AutoCloseable {
         this.writer.write("}");
     }
 
+    private void writeInherentImpl(RustInherentImpl inherentImpl) throws IOException {
+        this.writer.write("impl ");
+        this.writeType(inherentImpl.type());
+        this.writer.write(" {");
+        this.writer.newLine();
+        this.writer.write("}");
+    }
+
     private void writeStructStruct(RustStructStruct structStruct) throws IOException {
         this.writeDocComment(structStruct.docComment());
         this.writer.write("pub struct ");
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustInherentImpl.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustInherentImpl.java
new file mode 100644
index 0000000..55447bb
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustInherentImpl.java
@@ -0,0 +1,32 @@
+// Generated by hobgoblin.
+
+package org.zwobble.hobgoblin.compiler.output.lang.rust.ast;
+
+// Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl imports
+
+public record RustInherentImpl(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustType type) implements org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustItem {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl.Builder arbitrary() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl.Builder(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTypePath.arbitrary().build());
+    }
+
+    public record Builder(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustType type) implements org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustItem.Builder {
+        public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl build() {
+            return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl(type);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl.Builder withType(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustType type) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl.Builder(type);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl.Builder withType(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustType.Builder type) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl.Builder(type.build());
+        }
+
+        // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl.Builder body
+        // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl.Builder body
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl body
+}
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustItem.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustItem.java
index 4471b49..5da65a1 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustItem.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustItem.java
@@ -5,7 +5,7 @@ package org.zwobble.hobgoblin.compiler.output.lang.rust.ast;
 // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustItem imports
 // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustItem imports
 
-public sealed interface RustItem permits org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustEnum, org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustStructStruct {
+public sealed interface RustItem permits org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustEnum, org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl, org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustStructStruct {
     public interface Builder {
         public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustItem build();
 
-- 
cgit v1.2.3