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kotlinlang

I'm bumping up some lib with the latest(sh) kotest
```api("io.kotest:kotest-runner-junit5:4.6.1")
api("io.kotest:kotest-assertions-core:4.6.1")```
this used to work in the past, but now it doesnt get picked up any more
```    init {
        val BCN_Epileptic = "BCN_Epileptic.X"
        BCN_Epileptic {
            ...
        }
    }```
It works only if I use instantiate and `invoke` on the string itself directly, that is
```    init {
        "BCN_Epileptic.X" {
            ...
        }
    }```


I added this to the test suite and it works.
<https://github.com/kotest/kotest/blob/master/kotest-tests/kotest-tests-core/src/jvmTest/kotlin/com/sksamuel/kotest/specs/stringspec/StringSpecTest.kt#L25-L27|https://github.com/kotest/kotest/blob/master/kotest-tests/kotest-tests-core/src/jv[…]t/kotlin/com/sksamuel/kotest/specs/stringspec/StringSpecTest.kt>