Internal compiler error with `fseek` FFI

Incorrect ambiguous use of method error

I can't find the information about how to install llvm-config.pc so Xcode can find it.

Investigate ways to detect stack overflows

SPEC: Unicode character literals should use `\u{...}` syntax

Create an issue template

Simplify XCode Swift builds

CMake build broken in CI on Windows

Add an Indirect box data structure in the standard library for recursive data structures

Update readme to make it a requirement to use Hylo LLVM build