From 5447ee9766b101d20fdb1745b6f57411d6896264 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Thu, 2 Jul 2026 10:03:41 +0100
Subject: Add fieldless enum variants to Rust AST

---
 .../compiler/output/lang/rust/RustWriterTests.java | 25 ++++++++++++++++
 .../rust/ast/RustEnumVariantNoFieldsMatcher.java   | 33 ++++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustEnumVariantNoFieldsMatcher.java

(limited to 'src/test/java/org/zwobble')

diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriterTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriterTests.java
index 84a1056..8b9bbe3 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriterTests.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriterTests.java
@@ -47,6 +47,31 @@ public class RustWriterTests {
             }"""));
     }
 
+    @Test
+    public void enumWithFieldlessVariants() throws IOException {
+        var rust = RustEnum.arbitrary()
+            .withName(new RustIdentifier("Shape"))
+            .withVariants(List.of(
+                RustEnumVariant.arbitrary()
+                    .withName(new RustIdentifier("Rectangle"))
+                    .withFields(RustEnumVariantNoFields.arbitrary().build())
+                    .build(),
+                RustEnumVariant.arbitrary()
+                    .withName(new RustIdentifier("Circle"))
+                    .withFields(RustEnumVariantNoFields.arbitrary().build())
+                    .build()
+            ))
+            .build();
+
+        var string = write(writer -> writer.writeItem(rust));
+
+        assertThat(string, equalTo("""
+            pub enum Shape {
+                Rectangle,
+                Circle,
+            }"""));
+    }
+
     @Test
     public void enumWithTupleVariants() throws IOException {
         var rust = RustEnum.arbitrary()
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustEnumVariantNoFieldsMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustEnumVariantNoFieldsMatcher.java
new file mode 100644
index 0000000..382b819
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustEnumVariantNoFieldsMatcher.java
@@ -0,0 +1,33 @@
+// Generated by hobgoblin.
+
+package org.zwobble.hobgoblin.compiler.output.lang.rust.ast;
+
+// Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustEnumVariantNoFieldsMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustEnumVariantNoFieldsMatcher imports
+
+public class RustEnumVariantNoFieldsMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustEnumVariantNoFieldsMatcher isRustEnumVariantNoFields() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustEnumVariantNoFieldsMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustEnumVariantNoFields>> submatchers;
+
+    private RustEnumVariantNoFieldsMatcher(java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustEnumVariantNoFields>> submatchers) {
+        this.submatchers = submatchers;
+    }
+
+    public org.zwobble.precisely.MatchResult match(java.lang.Object actual) {
+        return this.toMatcher().match(actual);
+    }
+
+    public org.zwobble.precisely.TextTree describe() {
+        return this.toMatcher().describe();
+    }
+
+    private org.zwobble.precisely.Matcher<java.lang.Object> toMatcher() {
+        return org.zwobble.precisely.Matchers.instanceOf(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustEnumVariantNoFields.class, this.submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustEnumVariantNoFieldsMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustEnumVariantNoFieldsMatcher body
+}
-- 
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