Bug 22300 – [REG 2.098-rc.2] `-checkaction=context` of a `shared` type with an `opCast` fails to compile

``` struct Fail { int value; @safe pure nothrow @nogc: bool opCast () shared const scope { return true; } } void main () { assert(shared(Fail).init); } ``` Compiled with `~/dlang/ldc-36198b36/bin/ldc2 -checkaction=context -run wat.d`: ``` /Users/geod24/dlang/ldc-36198b36/bin/../import/core/internal/dassert.d(194): Error: cannot implicitly convert expression `v.opCast()` of type `bool` to `const(Fail)` /Users/geod24/dlang/ldc-36198b36/bin/../import/core/internal/dassert.d(527): Error: template instance `core.internal.dassert.miniFormat!(shared(Fail))` error instantiating /Users/geod24/dlang/ldc-36198b36/bin/../import/core/internal/dassert.d(44): instantiated from here: `miniFormatFakeAttributes!(shared(Fail))` wat.d(11): instantiated from here: `_d_assert_fail!(shared(Fail))` ``` Worked fine in v2.097.0. Affects vibe-core so it's pretty serious.

@MoonlightSentinel created dlang/dmd pull request #13203 "Issue 22300 - Allow shared <-> unshared reinterpreting casts during CTFE" mentioning this issue: - Issue 22300 - Allow shared <-> unshared reinterpreting casts during CTFE CTFE evaluation is single threaded only, hence it's safe to discard the `shared` qualifier in a reinterpreting cast. This change allows `-checkaction=context` to use a reinterpreting cast for compile and runtime - which removes the problematic workaround that caused the regression. https://github.com/dlang/dmd/pull/13203

dlang/dmd pull request #13203 "Issue 22300 - Allow shared <-> unshared reinterpreting casts during CTFE" was merged into stable: - 80a4215978914d1860263da89884e6799679b36e by MoonlightSentinel: Issue 22300 - Allow shared <-> unshared reinterpreting casts during CTFE CTFE evaluation is single threaded only, hence it's safe to discard the `shared` qualifier in a reinterpreting cast. This change allows `-checkaction=context` to use a reinterpreting cast for compile and runtime - which removes the problematic workaround that caused the regression. https://github.com/dlang/dmd/pull/13203

@MoonlightSentinel created dlang/druntime pull request #3594 "purge changelog" fixing this issue: - Fix 22300 - Use reinterpreting cast for shared types during CTFE Using the same method for compile- and runtime was enabled by dlang/dmd#13203. Using a reinterpreting cast avoids any potentially calling into user-defined `opCast` methods which might reject the cast. https://github.com/dlang/druntime/pull/3594

dlang/druntime pull request #3594 "Fix 22300 - Use reinterpreting cast for shared types during CTFE" was merged into stable: - 54cc0705b6d412874087f79ba8e1c54042280397 by MoonlightSentinel: Fix 22300 - Use reinterpreting cast for shared types during CTFE Using the same method for compile- and runtime was enabled by dlang/dmd#13203. Using a reinterpreting cast avoids any potentially calling into user-defined `opCast` methods which might reject the cast. https://github.com/dlang/druntime/pull/3594

dlang/dmd pull request #13209 "Merge stable into master" was merged into master: - 7f9ce4504af4cf08569493c1756a70b3f2faaaf9 by MoonlightSentinel: Issue 22300 - Allow shared <-> unshared reinterpreting casts during CTFE CTFE evaluation is single threaded only, hence it's safe to discard the `shared` qualifier in a reinterpreting cast. This change allows `-checkaction=context` to use a reinterpreting cast for compile and runtime - which removes the problematic workaround that caused the regression. https://github.com/dlang/dmd/pull/13209

dlang/druntime pull request #3615 "Merge `stable` in `mater`" was merged into master: - e8121cc6aaccfe5359071d077495de0c989be24c by MoonlightSentinel: Fix 22300 - Use reinterpreting cast for shared types during CTFE Using the same method for compile- and runtime was enabled by dlang/dmd#13203. Using a reinterpreting cast avoids any potentially calling into user-defined `opCast` methods which might reject the cast. https://github.com/dlang/druntime/pull/3615