fix: release WRITE FILE expression values

tools/validate_v1_17.py

@@ -51,6 +51,7 @@ def main():
     run([sys.executable, "tools/validate_get_argument_expression_cleanup.py"])
     run([sys.executable, "tools/validate_get_env_expression_cleanup.py"])
     run([sys.executable, "tools/validate_read_file_expression_cleanup.py"])
+    run([sys.executable, "tools/validate_write_file_expression_cleanup.py"])
     run([sys.executable, "tools/validate_version_convention.py"])
     run([str(EXE), "examples/networking.claro"])
     print("v1.18.26 validation complete")

tools/validate_write_file_expression_cleanup.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+"""Check WRITE FILE releases evaluated path and content values."""
+from pathlib import Path
+import os
+import subprocess
+import sys
+import tempfile
+
+ROOT = Path(__file__).resolve().parent.parent
+
+
+def main() -> int:
+    if os.name == "nt":
+        print("SKIP: LeakSanitizer check is POSIX-only")
+        return 0
+    with tempfile.TemporaryDirectory(prefix="write-expression-cleanup-", dir=os.environ.get("TMPDIR")) as tmp:
+        tmp_path = Path(tmp)
+        target = tmp_path / "output.txt"
+        script = tmp_path / "repeated_write.claro"
+        path = str(target).replace('\\', '\\\\').replace('"', '\\"')
+        script.write_text((f'WRITE FILE "{path}" WITH "hello"\n' * 2000), encoding="utf-8")
+        binary = tmp_path / "claro-asan"
+        build = subprocess.run(
+            ["gcc", "-std=c99", "-O0", "-g", "-fsanitize=address,undefined", "src/claro.c", "-o", str(binary), "-lm"],
+            cwd=ROOT, text=True, capture_output=True,
+        )
+        if build.returncode:
+            print(build.stdout, end="")
+            print(build.stderr, end="", file=sys.stderr)
+            return build.returncode
+        run = subprocess.run([str(binary), str(script)], cwd=ROOT, text=True, capture_output=True,
+                             env={**os.environ, "ASAN_OPTIONS": "detect_leaks=1"})
+        if run.returncode or "LeakSanitizer" in run.stderr or "SUMMARY:" in run.stderr:
+            print("FAIL: repeated WRITE FILE expressions retain allocations")
+            print(run.stdout, end="")
+            print(run.stderr, end="", file=sys.stderr)
+            return 1
+        if target.read_text(encoding="utf-8") != "hello":
+            print("FAIL: WRITE FILE output changed")
+            return 1
+        print("PASS: repeated WRITE FILE expressions release temporary values")
+        return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())