From 68efffb46ade1393c6412109dabf89a7c6d135e2 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 19 Jul 2026 21:35:22 +0100
Subject: Add tuple struct patterns to Rust AST

---
 .../compiler/output/lang/rust/RustWriterTests.java | 39 +++++++++++++++++++
 .../rust/ast/RustTupleStructPatternMatcher.java    | 45 ++++++++++++++++++++++
 2 files changed, 84 insertions(+)
 create mode 100644 src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTupleStructPatternMatcher.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 c766157..1d04b72 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
@@ -901,6 +901,45 @@ public class RustWriterTests {
         assertThat(string, equalTo("X::Y"));
     }
 
+    // === Tuple struct patterns ===
+
+    @Test
+    public void tupleStructPatternWithNoItems() throws IOException {
+        var rust = RustTupleStructPattern.arbitrary()
+            .withConstructor(RustPath.of("X", "Y"))
+            .build();
+
+        var string = write(writer -> writer.writePattern(rust));
+
+        assertThat(string, equalTo("X::Y()"));
+    }
+
+    @Test
+    public void tupleStructPatternWithOneItem() throws IOException {
+        var rust = RustTupleStructPattern.arbitrary()
+            .withConstructor(RustPath.of("X", "Y"))
+            .addItem(RustIdentifierPattern.arbitrary().withVariableName(RustIdentifier.of("a")))
+            .build();
+
+        var string = write(writer -> writer.writePattern(rust));
+
+        assertThat(string, equalTo("X::Y(a)"));
+    }
+
+    @Test
+    public void tupleStructPatternWithMultipleItems() throws IOException {
+        var rust = RustTupleStructPattern.arbitrary()
+            .withConstructor(RustPath.of("X", "Y"))
+            .addItem(RustIdentifierPattern.arbitrary().withVariableName(RustIdentifier.of("a")))
+            .addItem(RustIdentifierPattern.arbitrary().withVariableName(RustIdentifier.of("b")))
+            .addItem(RustIdentifierPattern.arbitrary().withVariableName(RustIdentifier.of("c")))
+            .build();
+
+        var string = write(writer -> writer.writePattern(rust));
+
+        assertThat(string, equalTo("X::Y(a, b, c)"));
+    }
+
     // === Wildcard patterns ===
 
     @Test
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTupleStructPatternMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTupleStructPatternMatcher.java
new file mode 100644
index 0000000..b725214
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTupleStructPatternMatcher.java
@@ -0,0 +1,45 @@
+// Generated by hobgoblin.
+
+package org.zwobble.hobgoblin.compiler.output.lang.rust.ast;
+
+// Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPatternMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPatternMatcher imports
+
+public class RustTupleStructPatternMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPatternMatcher isRustTupleStructPattern() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPatternMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern>> submatchers;
+
+    private RustTupleStructPatternMatcher(java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern>> 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.RustTupleStructPattern.class, this.submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPatternMatcher withConstructor(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPath> constructor) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("constructor", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern::constructor, constructor));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPatternMatcher(submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPatternMatcher withItems(org.zwobble.precisely.Matcher<? super java.util.List<org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern>> items) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("items", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern::items, items));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPatternMatcher(submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPatternMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPatternMatcher body
+}
-- 
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