From f6d9218df26adb6f377acc6cf1b821dca710f73b Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Tue, 14 Jul 2026 20:01:33 +0100
Subject: Add RustImplTraitType

---
 .../compiler/output/lang/rust/RustWriterTests.java | 13 ++++++++
 .../lang/rust/ast/RustImplTraitTypeMatcher.java    | 39 ++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustImplTraitTypeMatcher.java

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

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 776d51d..da07c8a 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
@@ -460,6 +460,19 @@ public class RustWriterTests {
         assertThat(string, equalTo("f(x, y)"));
     }
 
+    // == Types ==
+
+    @Test
+    public void implTraitType() throws IOException {
+        var rust = RustImplTraitType.arbitrary()
+            .withTrait(RustTypePath.of("std", "io", "Read"))
+            .build();
+
+        var string = write(writer -> writer.writeType(rust));
+
+        assertThat(string, equalTo("impl std::io::Read"));
+    }
+
     // == Paths ==
 
     @Test
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustImplTraitTypeMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustImplTraitTypeMatcher.java
new file mode 100644
index 0000000..02afb08
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustImplTraitTypeMatcher.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.RustImplTraitTypeMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustImplTraitTypeMatcher imports
+
+public class RustImplTraitTypeMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustImplTraitTypeMatcher isRustImplTraitType() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustImplTraitTypeMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustImplTraitType>> submatchers;
+
+    private RustImplTraitTypeMatcher(java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustImplTraitType>> 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.RustImplTraitType.class, this.submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustImplTraitTypeMatcher withTrait(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTypePath> trait) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustImplTraitType>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("trait", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustImplTraitType::trait, trait));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustImplTraitTypeMatcher(submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustImplTraitTypeMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustImplTraitTypeMatcher body
+}
-- 
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