fix Issue 13300 - pure function 'std.array.Appender!(T[]).Appender.ensureAddable' cannot call impure function 'test.T.__fieldPostBlit'
Merge pull request #2439 from 9rnsr/fix13300

[REG2.067a] Issue 13300 - pure function 'std.array.Appender!(T[]).Appender.ensureAddable' cannot call impure function 'test.T.__fieldPostBlit'