Comments after field are not recognized as comment

[dhoepelman]

Github syntax highlighting does not correctly highlight comments after data class field definitions:

data class A(
  val field: Int  // This is a comment, when is not a keyword
)

// This is a comment, when is not a keyword

Expected output (IntelliJ):

I came here through Github's "fixing syntax highlighting page", which indicates that this is a bug in the Kotlin grammar used. Apologies if this is the incorrect place.