https://issues.dlang.org/show_bug.cgi?id=22578
Issue ID: 22578
Summary: Symbols exposed by means of compile-time evaluation
are not eligible for selective imports.
Product: D
Version: D2
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P1
Component: dmd
Assignee: [email protected]
Reporter: [email protected]
This may not be fixable either on principle or on account of being too onerous
to implement or support.
Among the implementation mechanisms for versioning (see e.g.
https://github.com/dlang/phobos/pull/8309) we need a means to expose symbols in
a controlled manner. One possibility is to do so programmatically by means of
introspection and code generation, e.g.:
static foreach (s; __traits(allMembers, canon!"std"))
{
mixin("alias "~s~" = canon!`std`."~s~";");
}
This code exposes symbols such as `std.algorithm.comparison.canon!"std".among`
as `std.algorithm.comparison.among`. It has the usual automation advantages
compared with repeated alias directives:
alias among = canon!"std".among;
...
However (and this is the subject of this issue), symbols exported by means of
`static foreach` and `mixin` are not usable in selective imports. For example,
if another module attempts:
import std.algorithm.comparison : among;
then the symbol exposed with a plain `alias` will work, but the symbol exposed
programmatically will not.
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