Intellij-rust: Support const generics

[akofke]

Now that const generics (rust-lang/rust#44580) is usable in nightly, it would be great if it could be supported in intellij-rust, at least the syntax if not completion etc. Right now they don't seem to parse correctly and produce errors including the two shown below as well as breaking indentation in struct declarations. This code compiles on recent nightlies (2019-06-05).

• [x] parsing
• [x] name resolution/completion
• [x] type inference
• [ ] annotations & inspections
  
  
  
  • [x] "experimental feature" annotation
  
  
  • [ ] fix "X must be declared prior to Y" inspection
  
  
  • [ ] "wrong number of const arguments" inspection
  
  
• [x] basic const evaluation
• [x] check types of const arguments
• [x] special highlighting

[vlad20012]

Ooooooooooooohhhhhhhhhhhh noooooooooooooooo 😞😞😞

[vlad20012]

@mchernyavsky would you like to implement it ?)?)?) :):):)

[kmaork]

Hey @mchernyavsky @vlad20012 , what's the status of this issue? Can I offer help in order to resolve it?