Static kCTFontTraitsAttribute 

pub unsafe static kCTFontTraitsAttribute: &'static CFString

Available on crate feature CTFontDescriptor only.

kCTFontTraitsAttribute

The font traits dictionary.

This is the key for accessing the dictionary of font traits for stylistic information. See CTFontTraits.h for the list of font traits. The value associated with this key is a CFDictionaryRef.

See also Apple’s documentation