placeholder

builtins.placeholder

Primop

Docs pulled from | This Revision | about 2 hours ago

Nix manual

Takes 1 arguments

output

Return an output placeholder string for the specified output that will be substituted by the corresponding output path at build time.

Typical outputs would be "out", "bin" or "dev".

Noogle detected

Aliases

lib.placeholder

Detected Type

placeholder :: String -> String

Implementation

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

src/libexpr/primops.cc:1900

static void prim_placeholder(EvalState & state, const PosIdx pos, Value ** args, Value & v)
{
    v.mkString(
        hashPlaceholder(state.forceStringNoCtx(
            *args[0], pos, "while evaluating the first argument passed to builtins.placeholder")),
        state.mem);
}