# Kotlin Programming Language

Welcome to [Kotlin](https://kotlinlang.org/)!   
It is an open-source, statically typed programming language supported and developed by [JetBrains](https://www.jetbrains.com/) and open-source contributors.

Some handy links:

 * [Kotlin Site](https://kotlinlang.org/)

    }
    override val receiverType: KtType? by cached {
        firSymbol.resolvedReceiverTypeRef?.let { typeRef ->
            firSymbolBuilder.typeBuilder.buildKtType(coneSubstitutor.substituteOrSelf(typeRef.coneType))
        }
    }

    override fun substitute(substitutor: KtSubstitutor): KtFirVariableLikeSignature<S> = withValidityAssertion {