Resolve target: value-parameter x: kotlin.Any? smart-cast to kotlin.String
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// COMPILER_ARGUMENTS: -XXLanguage:+AllowContractsForCustomFunctions -XXLanguage:+UseReturnsEffect
package test

import kotlin.contracts.*

@OptIn(ExperimentalContracts::class)
fun myRequire(x: Boolean) {
    contract {
        returns() implies x
    }
}

fun testContractFromSource(x: Any?, y: Any?) {
    myRequire(x is String)
    myRequire(y is String)

    <caret>x.length

    /* STATEMENT DELETED: myRequire(x is Int) */
}