6001 – CTFE: ICE(interpret.c) mutating array passed by ref

import std.conv;
enum s = to!string(cast(dchar)0); 
dmd aborts with:
Assertion failure: '(newval->op == TOKarrayliteral || newval->op == TOKassocarrayliteral || newval->op == TOKstring || newval->op == TOKslice || newval->op == TOKnull)' on line 2680 in file 'interpret.c'

Reduced test case:
-----------------------
void e(ref int[] s) { // must pass by ref or out
 int[] r = s; // must alias that parameter
 s ~= 0; // must mutate 's' or 'r'
}
bool f() {
 int[] s;
 e(s);
 return false;
}
enum g = f();
-----------------------
Assertion failed: ((newval->op == TOKarrayliteral || newval->op == TOKassocarrayliteral || newval->op == TOKstring || newval->op == TOKslice || newval->op == TOKnull)), function interpretAssignCommon, file interpret.c, line 2680.
Abort trap
-----------------------

D2:
https://github.com/D-Programming-Language/dmd/commit/3bcaf85ed7aa480da34fba5a1fe0d00bc8f7abf5
D1:
https://github.com/D-Programming-Language/dmd/commit/669cafeb9fecc98d5f4689f379f638a9661f0b35 

*** Issue 6134 has been marked as a duplicate of this issue. ***