From e467fb1ce8b601c11a20e029c9b941cf4d6ba121 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 19 Jul 2026 17:22:43 +0100
Subject: Add wildcard patterns to Rust AST

---
 .../compiler/output/lang/rust/RustWriterTests.java | 26 +++++++++++++++++
 .../lang/rust/ast/RustWildcardPatternMatcher.java  | 33 ++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustWildcardPatternMatcher.java

(limited to 'src/test')

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 5ffebf1..d036f78 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
@@ -835,6 +835,32 @@ public class RustWriterTests {
         assertThat(string, equalTo("a + b + (c + d)"));
     }
 
+    // == Patterns ==
+
+    // === Identifier patterns ===
+
+    @Test
+    public void identifierPattern() throws IOException {
+        var rust = RustIdentifierPattern.arbitrary()
+            .withVariableName(RustIdentifier.of("x"))
+            .build();
+
+        var string = write(writer -> writer.writePattern(rust));
+
+        assertThat(string, equalTo("x"));
+    }
+
+    // === Wildcard patterns ===
+
+    @Test
+    public void wildcardPattern() throws IOException {
+        var rust = RustWildcardPattern.arbitrary().build();
+
+        var string = write(writer -> writer.writePattern(rust));
+
+        assertThat(string, equalTo("_"));
+    }
+
     // == Types ==
 
     @Test
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustWildcardPatternMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustWildcardPatternMatcher.java
new file mode 100644
index 0000000..26eee96
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustWildcardPatternMatcher.java
@@ -0,0 +1,33 @@
+// Generated by hobgoblin.
+
+package org.zwobble.hobgoblin.compiler.output.lang.rust.ast;
+
+// Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustWildcardPatternMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustWildcardPatternMatcher imports
+
+public class RustWildcardPatternMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustWildcardPatternMatcher isRustWildcardPattern() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustWildcardPatternMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustWildcardPattern>> submatchers;
+
+    private RustWildcardPatternMatcher(java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustWildcardPattern>> 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.RustWildcardPattern.class, this.submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustWildcardPatternMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustWildcardPatternMatcher body
+}
-- 
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