Bug 21296 – std.variant.Variant cannot be initialized with immutable AA

I confirmed this issue with dmd 2.094.0 on my WSL environment and with run.dlang.io (https://run.dlang.io/is/EI2fhc). - How to reproduce: ``` $ cat sample.d import std.variant; void main() { immutable aa = ["0":0]; auto v = Variant(aa); } $ dmd sample.d ``` - Expected behavior: The dmd command successfully compiles the source code and generates an executable file. - Actual behavior: It fails compiling with the following messages: ``` $ dmd sample.d /home/ttanjo/dlang/dmd-2.094.0/linux/bin64/../../src/phobos/std/variant.d(490): Error: cannot modify immutable expression (*zis)[args[1].get()] /home/ttanjo/dlang/dmd-2.094.0/linux/bin64/../../src/phobos/std/variant.d(707): Error: template instance std.variant.VariantN!32LU.VariantN.handler!(immutable(int[string])) error instantiating /home/ttanjo/dlang/dmd-2.094.0/linux/bin64/../../src/phobos/std/variant.d(604): instantiated from here: opAssign!(immutable(int[string])) sample.d(6): instantiated from here: __ctor!(immutable(int[string])) ``` I guess this issue is the source of the problem of Issue 13930.

dlang/phobos pull request #7652 "Fix issue 21296 - std.variant.Variant cannot be initialized with immu…" was merged into master: - 772c7fcf833d22ccb89f1e9608ce3ee92dfe2c73 by Tomoya Tanjo: Fix issue 21296 - std.variant.Variant cannot be initialized with immutable AA https://github.com/dlang/phobos/pull/7652