aliasSeq naming conflict

[crazymonkyyy]

alias foo=AliasSeq!(float(13.37));
import std;

order matters

test.d(1): Error: `AliasSeq` matches conflicting symbols:
/home/monkyyy/bin/opend_/bin/../import/core/internal/traits.d(11):        template `core.internal.traits.AliasSeq(TList...)`
/home/monkyyy/bin/opend_/bin/../import/std/meta.d(89):        template `std.meta.AliasSeq(TList...)`

[0xEAB]

Reduced version:

alias foo=AliasSeq!(float(13.37));
public import std.datetime, std.meta;

[0xEAB]

The root cause appears to be a compiler bug: dlang/dmd#18223
The issue originates from druntime. (Where a selective import leaks the symbol core.internal.traits.AliasSeq through.)

While it is probably possible to work around this issue in Phobos, applying a workaround upstream in druntime would be much easier AFAICT.

diff --git a/druntime/src/core/time.d b/druntime/src/core/time.d
index dc79141efa..f14df5b66a 100644
--- a/druntime/src/core/time.d
+++ b/druntime/src/core/time.d
@@ -3925,7 +3925,10 @@ version (CoreUnittest) const(char)* numToStringz()(long value) @trusted pure not
 }
 
 
-import core.internal.traits : AliasSeq;
+// Workaround for <https://github.com/dlang/dmd/issues/18223>.
+// A selective import of `AliasSeq` happens to bleed through and causes symbol clashes downstream.
+// import.core.internal.traits : AliasSeq;
+import core.internal.traits;
 
 
 /+ An adjusted copy of std.exception.assertThrown. +/

[0xEAB]

Works for me since dlang/dmd@1a15d20.