warn
lib.warn
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warn message value
Print a warning before returning the second argument.
See builtins.warn (Nix >= 2.23).
On older versions, the Nix 2.23 behavior is emulated with builtins.trace, including the NIX_ABORT_ON_WARN behavior, but not the nix.conf setting or command line option.
Inputs
message(String)-
Warning message to print before evaluating
value. value(any value)-
Value to return as-is.
Type
String -> a -> a