From 83889b150c7e2da0bc3658054f4fe25cc0808392 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Fri, 17 Jul 2026 17:32:12 +0100
Subject: Add tuple expression to Rust AST

---
 .../compiler/output/lang/rust/RustWriterTests.java | 35 +++++++++++++++++++
 .../lang/rust/ast/RustTupleExpressionMatcher.java  | 39 ++++++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTupleExpressionMatcher.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 ea6334f..eebc834 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
@@ -641,6 +641,41 @@ public class RustWriterTests {
         assertThat(string, equalTo("a?"));
     }
 
+    // === Tuple expressions ===
+
+    @Test
+    public void tupleExpressionUnit() throws IOException {
+        var rust = RustTupleExpression.arbitrary().build();
+
+        var string = write(writer -> writer.writeExpression(rust));
+
+        assertThat(string, equalTo("()"));
+    }
+
+    @Test
+    public void tupleExpressionSingleton() throws IOException {
+        var rust = RustTupleExpression.arbitrary()
+            .addElement(RustPath.of("a"))
+            .build();
+
+        var string = write(writer -> writer.writeExpression(rust));
+
+        assertThat(string, equalTo("(a,)"));
+    }
+
+    @Test
+    public void tupleExpressionManyElements() throws IOException {
+        var rust = RustTupleExpression.arbitrary()
+            .addElement(RustPath.of("a"))
+            .addElement(RustPath.of("b"))
+            .addElement(RustPath.of("c"))
+            .build();
+
+        var string = write(writer -> writer.writeExpression(rust));
+
+        assertThat(string, equalTo("(a, b, c)"));
+    }
+
     // == Types ==
 
     @Test
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTupleExpressionMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTupleExpressionMatcher.java
new file mode 100644
index 0000000..450ae91
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTupleExpressionMatcher.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.RustTupleExpressionMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleExpressionMatcher imports
+
+public class RustTupleExpressionMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleExpressionMatcher isRustTupleExpression() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleExpressionMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleExpression>> submatchers;
+
+    private RustTupleExpressionMatcher(java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleExpression>> 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.RustTupleExpression.class, this.submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleExpressionMatcher withElements(org.zwobble.precisely.Matcher<? super java.util.List<org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustExpression>> elements) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleExpression>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("elements", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleExpression::elements, elements));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleExpressionMatcher(submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleExpressionMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleExpressionMatcher body
+}
-- 
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