Bug 23192 – Can't iterate aggregate fields with static foreach inside a member function

As of DMD 2.100.0, the following program fails to compile: --- alias AliasSeq(Args...) = Args; struct S { int x; void fun() { static foreach (sym; AliasSeq!(S.x)) {} } } --- The error message is --- bug.d(8): Error: value of `this` is not known at compile time --- This is likely caused by the compiler treating the loop variable `sym` as an expression rather than an alias, since replacing the `static foreach` loop with an explicit alias declaration causes compilation to succeed: --- struct S { int x; void fun() { alias sym = S.x; // no error } } --- It is worth noting that the language spec's description of `static foreach` explicitly forbids this: > Within the i-th copy, the name of the static foreach variable > is bound to the i-th entry of the sequence, either as an enum > variable declaration (for constants) or an alias declaration > (for symbols). (In particular, static foreach variables are > never runtime variables.) https://dlang.org/spec/version.html#staticforeach

@BorisCarvajal created dlang/dmd pull request #14227 "Fix Issue 23192 - Can't iterate aggregate fields with static foreach inside a member function" fixing this issue: - Fix Issue 23192 - Can't iterate aggregate fields with static foreach inside a member function https://github.com/dlang/dmd/pull/14227

dlang/dmd pull request #14227 "Fix Issue 23192 - Can't iterate aggregate fields with static foreach inside a member function" was merged into master: - 200d58ae800d43c6cd093c8346f9033565c43bb4 by Boris Carvajal: Fix Issue 23192 - Can't iterate aggregate fields with static foreach inside a member function https://github.com/dlang/dmd/pull/14227