pub(super) fn eval_meta_expr(
program: &Program,
expr: &MetaExpr,
env: &mut BTreeMap<String, MetaValue>,
function_table: &BTreeMap<String, &MetaFunctionDecl>,
runtime_scope: &BTreeMap<String, Option<TypeExpr>>,
builder_env_cursor: Option<&mut BuilderEnvCursor>,
) -> Result<MetaValue, MetaEvalError>