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nix-super/tests/functional/lang/eval-okay-deprecate-cursed-or.err.exp

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libexpr: deprecate the bogus "or"-as-variable As a prelude to making "or" work like a normal variable, emit a warning any time the "fn or" production is used in a context that will change how it is parsed when that production is refactored. In detail: in the future, OR_KW will be moved to expr_simple, and the cursed ExprCall production that is currently part of the expr_select nonterminal will be generated "normally" in expr_app instead. Any productions that accept an expr_select will be affected, except for the expr_app nonterminal itself (because, while expr_app has a production accepting a bare expr_select, its other production will continue to accept "fn or" expressions). So all we need to do is emit an appropriate warning when an expr_simple representing a cursed ExprCall is accepted in one of those productions without first going through expr_app. As the warning message describes, users can suppress the warning by wrapping their problematic "fn or" expressions in parentheses. For example, "f g or" can be made future-proof by rewriting it as "f (g or)"; similarly "[ x y or ]" can be rewritten as "[ x (y or) ]", etc. The parentheses preserve the current grouping behavior, as in the future "f g or" will be parsed as "(f g) or", just like "f g anything-else" is grouped. (Mechanically, this suppresses the warning because the problem ExprCalls go through the "expr_app : expr_select" production, which resets the cursed status on the ExprCall.)
2024-09-20 22:57:36 +03:00
warning: at /pwd/lang/eval-okay-deprecate-cursed-or.nix:3:47: This expression uses `or` as an identifier in a way that will change in a future Nix release.
Wrap this entire expression in parentheses to preserve its current meaning:
((x: x) or)
Give feedback at https://github.com/NixOS/nix/pull/11121
warning: at /pwd/lang/eval-okay-deprecate-cursed-or.nix:4:39: This expression uses `or` as an identifier in a way that will change in a future Nix release.
Wrap this entire expression in parentheses to preserve its current meaning:
((x: x + 1) or)
Give feedback at https://github.com/NixOS/nix/pull/11121
warning: at /pwd/lang/eval-okay-deprecate-cursed-or.nix:5:44: This expression uses `or` as an identifier in a way that will change in a future Nix release.
Wrap this entire expression in parentheses to preserve its current meaning:
((x: x) or)
Give feedback at https://github.com/NixOS/nix/pull/11121
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