From b94fc2c22021dc50381856f170fe9dca4b879468 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 18 Jul 2026 19:10:38 +0100
Subject: Add iterator loop expressions to Rust AST

---
 .../compiler/output/lang/rust/RustWriterTests.java | 23 ++++++++++
 .../ast/RustIteratorLoopExpressionMatcher.java     | 51 ++++++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustIteratorLoopExpressionMatcher.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 bf93c1d..e947db9 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
@@ -621,6 +621,29 @@ public class RustWriterTests {
         assertThat(string, equalTo("123i32"));
     }
 
+    // === Iterator expressions ===
+
+    @Test
+    public void iteratorExpression() throws IOException {
+        var rust = RustIteratorLoopExpression.arbitrary()
+            .withElementName(RustIdentifier.of("x"))
+            .withElements(RustPath.of("xs"))
+            .withBody(RustBlockExpression.arbitrary()
+                .withFinalOperand(RustCallExpression.arbitrary()
+                    .withFunction(RustPath.of("print"))
+                    .addArg(RustPath.of("x"))
+                )
+            )
+            .build();
+
+        var string = write(writer -> writer.writeTopLevelExpression(rust));
+
+        assertThat(string, equalTo("""
+            for x in xs {
+                print(x)
+            }"""));
+    }
+
     // === Prefix expressions ===
 
     @Test
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustIteratorLoopExpressionMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustIteratorLoopExpressionMatcher.java
new file mode 100644
index 0000000..6bd153a
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustIteratorLoopExpressionMatcher.java
@@ -0,0 +1,51 @@
+// Generated by hobgoblin.
+
+package org.zwobble.hobgoblin.compiler.output.lang.rust.ast;
+
+// Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpressionMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpressionMatcher imports
+
+public class RustIteratorLoopExpressionMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpressionMatcher isRustIteratorLoopExpression() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpressionMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpression>> submatchers;
+
+    private RustIteratorLoopExpressionMatcher(java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpression>> 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.RustIteratorLoopExpression.class, this.submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpressionMatcher withElementName(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIdentifier> elementName) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpression>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("elementName", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpression::elementName, elementName));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpressionMatcher(submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpressionMatcher withElements(org.zwobble.precisely.Matcher<? super 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.RustIteratorLoopExpression>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("elements", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpression::elements, elements));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpressionMatcher(submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpressionMatcher withBody(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustBlockExpression> body) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpression>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("body", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpression::body, body));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpressionMatcher(submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpressionMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIteratorLoopExpressionMatcher body
+}
-- 
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