Summary: append returned struct to array: Internal error:
                    ../ztc/cod1.c 168
           Product: D
           Version: 2.031
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P2
         Component: DMD

import std.stdio;

struct S {string s; this(string x){s=x;}}

immutable(S) mkS(){
  return S("mks hi");

void main(char[][] args) {
  immutable(S) s = mkS();
  immutable(S)[] ss;
  ss ~= S("plain hi");
  ss ~= cast(immutable(S)) S("plain hi");
  //ss ~=  mkS(); // --> "Internal error: ../ztc/cod1.c 1684"
  writeln(s.s, ", ", ss[0].s);

I think (hope?) this is all valid code. I.e.,

  ss ~= S("Hi"); //should be ok
  ss.length = ss.length + 1;
  ss[$-1] = S("plain hi"); //should fail to compile (as it indeed does)

In any case there is an ICE.

Error: ss[0] isn't mutable
Error: ss[0] isn't mutable

  //ss[0] = S("fail"); --> Error: ss[0] isn't mutable

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