//! Coverage tests for `validate_expr_in_exec_context` exercised via the public API.
//!
//! Since `validate_expr_in_exec_context` is private, we exercise it by calling
//! `validate_expr` on a `FunctionCall { name: "exec", args: [...] }` expression,
//! which internally dispatches to `validate_expr_in_exec_context` for each arg.
//! We also test via `validate_ast` and `validate_ir`.