[Issue 19969] Unhelpful error when attempting (incorrectly) to append to a string

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19969

Basile-z <b2.temp at gmx.com> changed:

           What    |Removed                     |Added
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             Blocks|10233                       |


Referenced Issues:

https://issues.dlang.org/show_bug.cgi?id=10233
[Issue 10233] [Tracker] Grammar issues
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