From 27dd47f88f1bfea84752d7bf30ef2f7ef3c8cc8e Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 26 Jul 2026 00:24:04 +0100
Subject: Add index expressions to Rust AST

---
 .../compiler/output/lang/rust/RustWriterTests.java | 14 +++++++
 .../lang/rust/ast/RustIndexExpressionMatcher.java  | 45 ++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustIndexExpressionMatcher.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 b5dd515..8946855 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
@@ -650,6 +650,20 @@ public class RustWriterTests {
             }"""));
     }
 
+    // === Index expressions ==
+
+    @Test
+    public void indexExpression() throws IOException {
+        var rust = RustIndexExpression.arbitrary()
+            .withIndexed(RustPath.of("x"))
+            .withIndex(RustPath.of("y"))
+            .build();
+
+        var string = write(writer -> writer.writeTopLevelExpression(rust));
+
+        assertThat(string, equalTo("x[y]"));
+    }
+
     // === Integer literals ===
 
     @Test
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustIndexExpressionMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustIndexExpressionMatcher.java
new file mode 100644
index 0000000..4261e0e
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustIndexExpressionMatcher.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.RustIndexExpressionMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpressionMatcher imports
+
+public class RustIndexExpressionMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpressionMatcher isRustIndexExpression() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpressionMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpression>> submatchers;
+
+    private RustIndexExpressionMatcher(java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpression>> 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.RustIndexExpression.class, this.submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpressionMatcher withIndexed(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustExpression> indexed) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpression>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("indexed", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpression::indexed, indexed));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpressionMatcher(submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpressionMatcher withIndex(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustExpression> index) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpression>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("index", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpression::index, index));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpressionMatcher(submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpressionMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustIndexExpressionMatcher body
+}
-- 
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