Fix for #5

3 files changed, 36 insertions, 0 deletions

diff --git a/tests/features/fstring_lib.h b/tests/features/fstring_lib.h
new file mode 100644
index 0000000..ef292d2
--- /dev/null
+++ b/tests/features/fstring_lib.h
@@ -0,0 +1,9 @@
+
+#ifndef FSTRING_LIB_H
+#define FSTRING_LIB_H
+
+static int lib_val() {
+    return 99;
+}
+
+#endif
diff --git a/tests/features/fstring_mod.zc b/tests/features/fstring_mod.zc
new file mode 100644
index 0000000..78b16ef
--- /dev/null
+++ b/tests/features/fstring_mod.zc
@@ -0,0 +1,4 @@
+
+fn get_val() -> int {
+    return 42;
+}
diff --git a/tests/features/test_fstring.zc b/tests/features/test_fstring.zc
new file mode 100644
index 0000000..3ef64a7
--- /dev/null
+++ b/tests/features/test_fstring.zc
@@ -0,0 +1,23 @@
+import "tests/features/fstring_mod.zc" as Mod;
+
+test "alias namespace fstring" {
+    // Tests that {Mod::get_val()} is parsed correctly (Mod_get_val)
+    var res = f"{Mod::get_val()}";
+    assert(res == "42", "Import namespace in f-string failed");
+    
+    // Check local string formatting via println (compile check)
+    println "Val: {Mod::get_val()}";
+}
+
+import "tests/features/fstring_lib.h" as Lib;
+
+test "alias C header fstring" {
+    // Tests that {Lib::lib_val()} resolves to lib_val() (no mangling/prefix)
+    // parser_expr.c strips alias for C headers.
+    // parser_utils.c rewrite_expr_methods needs to do the same.
+    var res = f"{Lib::lib_val()}";
+    assert(res == "99", "C header namespace in f-string failed");
+    
+    // Verify println (rewrite_expr_methods path)
+    println "C Val: {Lib::lib_val()}";
+}