From 001a701103c98581b96e41653d87156de667774d Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Fri, 17 Jul 2026 17:13:34 +0100
Subject: Add try propagation expression to Rust AST

---
 .../compiler/output/lang/rust/RustWriterTests.java | 13 ++++++++
 .../ast/RustTryPropagationExpressionMatcher.java   | 39 ++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTryPropagationExpressionMatcher.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 2568c42..bb40d71 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
@@ -628,6 +628,19 @@ public class RustWriterTests {
         assertThat(string, equalTo("X { a: b, c: d }"));
     }
 
+    // === Try propagation expressions ===
+
+    @Test
+    public void tryPropagationExpression() throws IOException {
+        var rust = RustTryPropagationExpression.arbitrary()
+            .withOperand(RustPath.of("a"))
+            .build();
+
+        var string = write(writer -> writer.writeExpression(rust));
+
+        assertThat(string, equalTo("a?"));
+    }
+
     // == Types ==
 
     @Test
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTryPropagationExpressionMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTryPropagationExpressionMatcher.java
new file mode 100644
index 0000000..171718c
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTryPropagationExpressionMatcher.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.RustTryPropagationExpressionMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTryPropagationExpressionMatcher imports
+
+public class RustTryPropagationExpressionMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTryPropagationExpressionMatcher isRustTryPropagationExpression() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTryPropagationExpressionMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTryPropagationExpression>> submatchers;
+
+    private RustTryPropagationExpressionMatcher(java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTryPropagationExpression>> 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.RustTryPropagationExpression.class, this.submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTryPropagationExpressionMatcher 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.RustTryPropagationExpression>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("operand", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTryPropagationExpression::operand, operand));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTryPropagationExpressionMatcher(submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTryPropagationExpressionMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTryPropagationExpressionMatcher body
+}
-- 
cgit v1.2.3