Bug 18403 – [REG2.078.2] Access violation when dmd tries to print highlighted code

Hello everyone and excuse me for everything wrong with this thread, I upgraded the dmd from version 2.078.1 to 2.078.2. Everything was working correctly in 2.078.1, but now my project won't build with 2.078.2, the dmd compiler exits with this message E:\bugtest>dub build Performing "debug" build using C:\D\dmd2\windows\bin\dmd.exe for x86. bugtest ~master: building configuration "application"... source\app.d(4,4): Deprecation: object.Error@(0): Access Violation ---------------- 0x0065445A 0x006548FE 0x0064DBD3 0x0064DE3F C:\D\dmd2\windows\bin\dmd.exe failed with exit code 1. E:\bugtest> Minimal reproduction example: void main() { ushort i; i=~i; } Yes, i'm using a feature which was deprecated. Again, excuse me if there is something wrong with this bug report

Also happens on other errors. Seems to be related to code highlighting via backticks in the error message. For example, a source file that's just "foo" also fails. But this works as expected even though it prints a deprecation message (but it doesn't have highlighted code): ---- void main() { shared int x; ++x; } ---- Never fails when dmd is invoked with `-color=off`. The diff between 2.078.1 and 2.078.2 is really small [1], and I can't spot anything that's related to code highlighting. [1] https://github.com/dlang/dmd/compare/v2.078.1...v2.078.2

Investigated further. This seems to be a case of dmd miscompiling itself. The access violation happens in `dmd.tokens.Token.isKeyword` when it accesses `keywords`. This is because of issue 18412. Pull request to work around that issue: https://github.com/dlang/dmd/pull/7859

Thanks for looking into this. I noticed this as well a little while ago when I was trying out dmd-nightly.

*** Issue 18431 has been marked as a duplicate of this issue. ***

Commit pushed to master at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/af5694e44f574008b00a2eb8ccb79d46ca3f9485 fix issue 18403 - [REG2.078.2] Access violation when dmd tries to print highlighted code (#7859) ... by moving the array declaration before the static constructor. This is a workaround for issue 18412 - [REG2.077.0] immutable array in library becomes null when referenced in static constructor.