SwiftSyntax 0.50100.0, Xcode 11.1. Made a simple SwiftPM project, used generate-xcodeproj to make a project to open (double-clicking the Package.swift file did not produce a buildable project).
I'm trying to create and use a SyntaxRewriter subclass from a thread other than main. I'm not sharing between threads, so it seems like it should be fine. However, I get an EXEC_BAD_ACCESS inside of SwiftSyntax. Here's some sample code that demonstrates the problem, which is adapted from the SwiftSyntax README's sample code:
It crashes with an EXEC_BAD_ACCESS, typically in `SyntaxRewriter.visitChildren()`. Trying to print any variables in the debugger outputs "Trying to put the stack in unreadable memory at <some memory address>".
I can't reproduce this in an optimized build.