Bump Rust toolchain to 1.45

[binarylogic]

We need to bump the Rust toolchain to 1.45 to unblock #3514. We've bumped this in the past, but it broke nightly releases because we need to upgrade to LLVM10.

[Hoverbear]

Some context:

PS C:\Users\ana> rustc +1.45.2 --version --verbose
rustc 1.45.2 (d3fb005a3 2020-07-31)
binary: rustc
commit-hash: d3fb005a39e62501b8b0b356166e515ae24e2e54
commit-date: 2020-07-31
host: x86_64-pc-windows-msvc
release: 1.45.2
LLVM version: 10.0

PS C:\Users\ana> rustc +1.44.0 --version --verbose
rustc 1.44.0 (49cae5576 2020-06-01)
binary: rustc
commit-hash: 49cae55760da0a43428eba73abcb659bb70cf2e4
commit-date: 2020-06-01
host: x86_64-pc-windows-msvc
release: 1.44.0
LLVM version: 9.0

As you can see, updating from Rust 1.44 to Rust 1.45 increases the LLVM version our builds need to link to. We also need to refer to the musl version from https://github.com/rust-lang/rust/blob/master/src/ci/docker/scripts/musl-toolchain.sh and possibly update that.

[tyrken]

FYI: The vector nightly builds have been failing for a week or so on Windows, which is slightly annoying as I'd like to switch from my fork to your latest builds (hopefully a release soon), and you only publish if all builds complete successfully.

The cause of the Windows fails looks suspiciously like rust-lang/rust#72470 which is confirmed as being in toolchain 1.44, they attempted to revert afterwards but don't know if its OK in 1.45 or even latest yet...

[yoshuawuyts]

but don't know if its OK in 1.45 or even latest yet...

We're still experiencing this issue at work, and remain pinned to Rust 1.43.0. To my knowledge this has not been addressed in the compiler yet.

[Hoverbear]

@tyrken Can you open a separate issue for that? I can try to address it. :)

[jamtur01]

@Hoverbear @tyrken That bug is addressed in 1.46 from what I can see from my initial take on this (#3700) but obviously that whole path is dependent on the LLVM upgrade.

[leebenson]

Bumping to rustc 1.45 is no longer required in #3514, per moving to async-graphql. I think we can skip this and bump straight to 1.46 once LLVM 10 lands. Closing.