Lint for CamelCase type names (Style Guide).

[pq]

From the style guide:

DO name types using UpperCamelCase.

Classes and typedefs should capitalize the first letter of each word (including the first word), and use no separators.

GOOD:

class SliderMenu {
  // ...
}

class HttpRequest {
  // ...
}

typedef num Adder(num x, num y);