[Issue 15638] no common type for const classes

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15638

--- Comment #4 from github-bugzilla at puremagic.com ---
Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/ee586e924e358db194f83f0c16c024d22ceebb99
typeMerge should take modifiers into account when searching for common base
class.

Fixes issue 15638.

Add test case to test suite.

https://github.com/D-Programming-Language/dmd/commit/c2c036248a462115f87a7baae352cfd026e66dfc
Merge pull request #5450 from quickfur/issue15638

typeMerge should take modifiers into account when searching for common base
class

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