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/RustWriterTests.java | 11 ++++++
 .../lang/rust/ast/RustInherentImplMatcher.java     | 39 ++++++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustInherentImplMatcher.java

(limited to 'src/test/java')

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 b5583ab..ea04006 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
@@ -127,6 +127,17 @@ public class RustWriterTests {
             }"""));
     }
 
+    @Test
+    public void emptyInherentImpl() throws IOException {
+        var rust = RustInherentImpl.arbitrary().withType(RustTypePath.of("Square")).build();
+
+        var string = write(writer -> writer.writeItem(rust));
+
+        assertThat(string, equalTo("""
+            impl Square {
+            }"""));
+    }
+
     @Test
     public void emptyStruct() throws IOException {
         var rust = RustStructStruct.arbitrary().withName(new RustIdentifier("Rectangle")).build();
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustInherentImplMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustInherentImplMatcher.java
new file mode 100644
index 0000000..23b23a1
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustInherentImplMatcher.java
@@ -0,0 +1,39 @@
+// Generated by hobgoblin.
+
+package org.zwobble.hobgoblin.compiler.output.lang.rust.ast;
+
+// Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImplMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImplMatcher imports
+
+public class RustInherentImplMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImplMatcher isRustInherentImpl() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImplMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl>> submatchers;
+
+    private RustInherentImplMatcher(java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl>> 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.RustInherentImpl.class, this.submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImplMatcher withType(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustType> type) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("type", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImpl::type, type));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImplMatcher(submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImplMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustInherentImplMatcher body
+}
-- 
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