From 02e2a52b22c7e56c396add075446c667f1f54bad Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Tue, 14 Jul 2026 21:42:59 +0100
Subject: Add borrow expressions to Rust AST

---
 .../compiler/output/lang/rust/RustWriterTests.java | 14 +++++++
 .../lang/rust/ast/RustPrefixExpressionMatcher.java | 45 ++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustPrefixExpressionMatcher.java

(limited to 'src/test/java')

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 625526b..7f85b8a 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
@@ -497,6 +497,20 @@ public class RustWriterTests {
         assertThat(string, equalTo("x.y"));
     }
 
+    // === Prefix expressions ===
+
+    @Test
+    public void borrowExpression() throws IOException {
+        var rust = RustPrefixExpression.arbitrary()
+            .withOperator(RustPrefixOperator.BORROW)
+            .withOperand(RustPath.of("x"))
+            .build();
+
+        var string = write(writer -> writer.writeExpression(rust));
+
+        assertThat(string, equalTo("&x"));
+    }
+
     // === Struct expressions ===
 
     @Test
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustPrefixExpressionMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustPrefixExpressionMatcher.java
new file mode 100644
index 0000000..dc3d418
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustPrefixExpressionMatcher.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.RustPrefixExpressionMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpressionMatcher imports
+
+public class RustPrefixExpressionMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpressionMatcher isRustPrefixExpression() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpressionMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpression>> submatchers;
+
+    private RustPrefixExpressionMatcher(java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpression>> 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.RustPrefixExpression.class, this.submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpressionMatcher withOperator(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixOperator> operator) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpression>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("operator", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpression::operator, operator));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpressionMatcher(submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpressionMatcher withOperand(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustExpression> operand) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpression>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("operand", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpression::operand, operand));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpressionMatcher(submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpressionMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustPrefixExpressionMatcher body
+}
-- 
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