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/RustWriter.java      | 21 ++++++++++
 .../compiler/output/lang/rust/ast/RustPattern.java |  2 +-
 .../lang/rust/ast/RustTupleStructPattern.java      | 48 ++++++++++++++++++++++
 3 files changed, 70 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTupleStructPattern.java

(limited to 'src/main/java')

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriter.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriter.java
index 0630e07..3f3f3d8 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriter.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriter.java
@@ -668,6 +668,10 @@ public class RustWriter implements AutoCloseable {
                 this.writePathPattern(pathPattern);
             }
 
+            case RustTupleStructPattern tupleStructPattern -> {
+                this.writeTupleStructPattern(tupleStructPattern);
+            }
+
             case RustWildcardPattern wildcardPattern -> {
                 this.writeWildcardPattern(wildcardPattern);
             }
@@ -690,6 +694,23 @@ public class RustWriter implements AutoCloseable {
         this.writePath(pathPattern.path());
     }
 
+    private void writeTupleStructPattern(
+        RustTupleStructPattern tupleStructPattern
+    ) throws IOException {
+        this.writePath(tupleStructPattern.constructor());
+        this.writer.write("(");
+
+        writeWithSeparator(
+            tupleStructPattern.items(),
+            this::writePattern,
+            () -> {
+                this.writer.write(", ");
+            }
+        );
+
+        this.writer.write(")");
+    }
+
     private void writeWildcardPattern(
         RustWildcardPattern wildcardPattern
     ) throws IOException {
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustPattern.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustPattern.java
index c24a1ee..1271ceb 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustPattern.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustPattern.java
@@ -5,7 +5,7 @@ package org.zwobble.hobgoblin.compiler.output.lang.rust.ast;
 // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern imports
 // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern imports
 
-public sealed interface RustPattern permits org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIdentifierPattern, org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustLiteralPattern, org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPathPattern, org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustWildcardPattern {
+public sealed interface RustPattern permits org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIdentifierPattern, org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustLiteralPattern, org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPathPattern, org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern, org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustWildcardPattern {
     public interface Builder {
         public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern build();
 
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTupleStructPattern.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTupleStructPattern.java
new file mode 100644
index 0000000..f67aa81
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTupleStructPattern.java
@@ -0,0 +1,48 @@
+// Generated by hobgoblin.
+
+package org.zwobble.hobgoblin.compiler.output.lang.rust.ast;
+
+// Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern imports
+
+public record RustTupleStructPattern(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPath constructor, java.util.List<org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern> items) implements org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder arbitrary() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPath.arbitrary().build(), java.util.List.of());
+    }
+
+    public record Builder(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPath constructor, java.util.List<org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern> items) implements org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern.Builder {
+        public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern build() {
+            return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern(constructor, items);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder withConstructor(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPath constructor) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder(constructor, items);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder withConstructor(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPath.Builder constructor) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder(constructor.build(), items);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder withItems(java.util.List<org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern> items) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder(constructor, items);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder addItem(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern item) {
+            var items = new java.util.ArrayList<org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern>(this.items);
+            items.add(item);
+            return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder(constructor, items);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder addItem(org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern.Builder item) {
+            var items = new java.util.ArrayList<org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPattern>(this.items);
+            items.add(item.build());
+            return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder(constructor, items);
+        }
+
+        // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder body
+        // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern.Builder body
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTupleStructPattern body
+}
-- 
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