A dup-ped associative array can't be assigned to immutable

[dlangBugzillaToGithub]

bearophile_hugs reported this on 2014-12-27T22:32:15Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=13900

Description

void main() {
    int[int] aa1 = [1:2];
    immutable aa2 = aa1.dup;
}


dmd 2.067alpha gives:

temp.d(3,24): Error: cannot implicitly convert expression (dup(aa1)) of type int[int] to immutable(int[int])

[thewilsonator]

reopening as #20564