From 8f5993f7dc213f8130204c3ea6facd814373fb3d Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 25 Jul 2026 23:26:55 +0100
Subject: Support trait object types in Rust AST

---
 .../compiler/output/lang/rust/RustWriterTests.java | 11 ++++++
 .../lang/rust/ast/RustTraitObjectTypeMatcher.java  | 39 ++++++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTraitObjectTypeMatcher.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 481d99e..fe1f9b4 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
@@ -1034,6 +1034,17 @@ public class RustWriterTests {
         assertThat(string, equalTo("()"));
     }
 
+    @Test
+    public void traitObjectTypeWithSingleTraitBound() throws IOException {
+        var rust = RustTraitObjectType.arbitrary()
+            .withBound(RustPath.of("Any"))
+            .build();
+
+        var string = write(writer -> writer.writeType(rust));
+
+        assertThat(string, equalTo("dyn Any"));
+    }
+
     @Test
     public void tupleTypeSingleton() throws IOException {
         var rust = RustTupleType.arbitrary()
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTraitObjectTypeMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTraitObjectTypeMatcher.java
new file mode 100644
index 0000000..8d79f6d
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTraitObjectTypeMatcher.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.RustTraitObjectTypeMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitObjectTypeMatcher imports
+
+public class RustTraitObjectTypeMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitObjectTypeMatcher isRustTraitObjectType() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitObjectTypeMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitObjectType>> submatchers;
+
+    private RustTraitObjectTypeMatcher(java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitObjectType>> 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.RustTraitObjectType.class, this.submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitObjectTypeMatcher withBound(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPath> bound) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitObjectType>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("bound", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitObjectType::bound, bound));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitObjectTypeMatcher(submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitObjectTypeMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitObjectTypeMatcher body
+}
-- 
cgit v1.2.3