Restrict "toml" dependency to <= 0.5.2

[CreepySkeleton]

The resent code change in toml crate made it require rustc 1.36+.

I see, you just dropped support for older versions, but unfortunately I can't really depend on trybuild conditionally (i.e. depending on rustc version, if it's possible please tell me). Features won't help me too because dev-dependencies cannot be optional.

Also, it's impossible to work this around by simply stopping running tests on rustc <1.36 because the toml crate is going to have to be build one way or another.

The only real options here are either drop support for rustc <1.36 for my crate (highly undesirable) or ditch trubuild (even less desirable).

Actually, I don't see any particular reason to move to toml 0.5.3. Could you please restrict this dependency and bring support for 1.31 back?

[dtolnay]

Can you pin the toml version on your end?

trybuild = "1.0"
toml = "=0.5.3"

I don't really want to get into the super conservative compiler version support game with trybuild. If that doesn't work, the alternative would be you could fork trybuild and maintain the old compiler support in the fork.

[CreepySkeleton]

Thanks for the hint, I didn't realized I could do that :) If it won't work out I'll just make my own fork.