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Add changelog entry for StdUnittest #6142

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17 changes: 17 additions & 0 deletions changelog/std-unittest.dd
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`version(StdUnittest)` is now used in Phobos

Similarly to the existing `CoreUnittest` which is used in DRuntime,
`-version=StdUnittest` has been added to the Phobos build scripts.

`StdUnittest` has been added to prevent leakage of symbols into user code and prevent execution of unittests from the standard library in user code when they were defined in templates.
As an additional bonus, compilation times for such templates are reduced.
For in-depth information about this topic, please see $(LINK2 https://wiki.dlang.org/DIP82, DIP82).

There no effects or actions required for users of the official build scripts.
However, quickly running the tests of a Phobos module, will now require `-version=StdUnittest`:

$(CONSOLE ~/dlang/generated/dmd/linux/release/64/dmd -unittest -main -version=StdUnittest std/file.d)

Note that `.test` is the officially supported Makefile rule to test an individual module:

$(CONSOLE make -f posix.mak std/file.test)