warn

lib.warn

Primop

Docs pulled from | This Revision | 4 days ago

Takes 2 arguments

e1, e2

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

(lib.trivial.warn)

Noogle detected

Aliases

builtins.warn
lib.trivial.warn

Implementation

This function is implemented in c++ and is part of the native nix runtime.