nrdmn

Fix calls to varargs C function fcntl

2

The ccall calling convention doesn't support varargs functions, so switch to capi instead. See https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/ffi.html#varargs-not-supported-by-ccall-calling-convention Related PR: https://github.com/haskellari/lukko/pull/23

> the first time anyone has put TrueType in UEFI It's not: https://github.com/nrdmn/uefi-freetype Binary: https://shells.aachen.ccc.de/~nick/comic_uefi.efi This is what it looks like: 

AK/Error: Fix value() and error() getters

2

Code like `auto& a = ErrorOr{1}.value();` should not compile. Credits to @famfo for finding the bug

AK/Optional: Make some member functions constexpr

5

This PR changes some of Optional's member functions to be constexpr - for now only the non-reference variant. Notably, this requires using construct_at instead of placement new to create the...