diff options
Diffstat (limited to 'src/libexpr')
| -rw-r--r-- | src/libexpr/parser/parser.cc | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/libexpr/parser/parser.cc b/src/libexpr/parser/parser.cc index 6e8ab2fe4..17463056c 100644 --- a/src/libexpr/parser/parser.cc +++ b/src/libexpr/parser/parser.cc @@ -668,6 +668,16 @@ template<> struct BuildAST<grammar::expr::uri> { template<> struct BuildAST<grammar::expr::ancient_let> : change_head<BindingsState> { static void success(const auto & in, BindingsState & b, ExprState & s, State & ps) { + // Added 2024-09-18. Turn into an error at some point in the future. + // See the documentation on deprecated features for more details. + if (!ps.featureSettings.isEnabled(Dep::AncientLet)) + warn( + "%s found at %s. This feature is deprecated and will be removed in the future. Use %s to silence this warning.", + "let {", + ps.positions[ps.at(in)], + "--extra-deprecated-features ancient-let" + ); + b.attrs.pos = ps.at(in); b.attrs.recursive = true; s.pushExpr<ExprSelect>(b.attrs.pos, b.attrs.pos, std::make_unique<ExprAttrs>(std::move(b.attrs)), ps.s.body); |