Does selective imports have an effect on the resulting executable?

[Gary Willoughby]

Does selective imports have an effect on the resulting 
executable? For example if i included the following at the top of 
my source to only include one function from a library:

import std.algorithm : reduce;
Would it have any impact on the resulting executable? i.e. only 
include compiled code for the selected functions?

If i imported the whole library like this:

import std.algorithm;

Is it more wasteful? Not as optimised? Any draw backs? Bigger 
executable?