Description
Is your feature request related to a problem? Please describe.
nix provides several ways to get where something is defined, but they are somewhat obscure and have unintuitive interfaces.
Describe the solution you'd like
the :pos command would take an attribute path and try to find where it is defined, using builtins.unsafeGetAttrPos, meta.position, and whatever it is that gets used when printing a lambda.
Describe alternatives you've considered
a builtin function would be nice, but because builtins.unsafeGetAttrPos needs a string argument, this needs to be implemented using something that can take an unevaluated expression and decompose it like a macro. as far as i know only repl commands can do that.
Priorities
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