Hello, is there any difference at all between the following lines, as an example:

import std.regex;
import std.regex : matchFirst;

What technical differences does it make (except for having the identifier available), using the colon?
Does it make any speed/optimization changes or am I better off just importing the whole module?

On Sunday, 19 March 2023 at 07:20:17 UTC, Jeremy wrote:

import std.regex;
import std.regex : matchFirst;

The colon-form, aka "selective import" has for effect

1. to create a local alias so this can indeed speedup symbol lookups in the sense that search will succeed before looking in the scope of the imports.
2. to make non-selected symbols, i.e not listed in the colon right hand side, in the import not available.

Note that using both makes no sense, but I guess you did that to express more clearly what you meant.

On Sunday, 19 March 2023 at 08:47:32 UTC, Basile B. wrote:

Ah, that makes sense. Thank you!