restructure: move el compiler content into lang/

lang/examples/reassign-in-if.el

@@ -0,0 +1,22 @@
+// reassign-in-if.el — acceptance test for bare reassignment inside if-body.
+//
+// Before fix: parser dropped `x = "override"` on the floor and codegen emitted
+// three orphan expressions (`x; EL_NULL; EL_STR("override");`). Effective store
+// was lost, so the function returned "default".
+//
+// After fix: parse_stmt recognises `Ident "=" Expr` as an Assign statement and
+// codegen emits a real C assignment, so the function returns "override".
+
+fn test_reassign() -> String {
+    let x: String = "default"
+    if true {
+        x = "override"
+    }
+    return x
+}
+
+fn main() -> Int {
+    let r: String = test_reassign()
+    print(r)
+    return 0
+}