I'm implementing the kotlin language spec (<https:...

# language-evolution

[aerb]

I'm implementing the kotlin language spec (https://github.com/Kotlin/kotlin-spec/blob/release/grammar/src/main/antlr/KotlinParser.g4#L254) as a hobby project and am a bit confused by the following rule:

typeReference
: userType
| DYNAMIC
;

Based on the definition of userType "dynamic" should be valid, so will DYNAMIC ever match?

[ephemient]

lexed as a keyword before getting to the parser

[aerb]

Oh interesting! So userType by definition can never be "dynamic"? I noticed DYNAMIC is also a part "simpleIdentifier" (which is used to define userType)

[ephemient]

hmm good point, I didn't spot that

[aerb]

As a test I tried parsing the word "dynamic" with the compiled KotlinParser from the kotlin-spec repo, and it resolved to "userType"

[aerb]

Also if there is a better channel please let me know 🙏

[ephemient]

#compiler maybe

[dmitriy.novozhilov]

Yes, dynamic in type position is always parsed as intrinsic type for js even if there is a class named dynamic

class dynamic // (1)

fun foo() {
    val x: dynamic /* dynamic type */ = dynamic() // constructor of (1)
}