[Issue 21756] Immutable array literals cause runtime GC allocation instead of static readonly section allocation

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21756

--- Comment #5 from Eyal <eyal at weka.io> ---
Neither the PR nor this solution seem to resolve the issue. Consider these
pieces of code.

Will NOT compile:

  @nogc string f() {
      static immutable s = "%5d".format(5);
      enum u = s;
      return u; // does GC :-(
  }

Will compile fine:

  @nogc string f() {
      static immutable s = "%5d".format(5);
      enum u = s ~ "";
      return u; // all is well
  }

Will also compile fine:

  @nogc string f() {
      static immutable s = "%5d".format(5) ~ "";
      enum u = s;
      return u; // all is well
  }

Surely this cannot be considered a reasonable state of things?

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