Not possible to use libs.xy based on TOML file inside of custom configuration with closure

[tprochazka]

I tested a new TOML file dependency definition introduced by #14896
Tested on 6.9-20201126230040+0000

There is missing possibility to declare dependency in this way:

val custom by configurations
custom(libs.uiSkeleton) {
    because("Some comment why why need this dependency")
}

it ends with
e: ...lib_ui_skeleton\build.gradle.kts:34:12: Type mismatch: inferred type is Provider<MinimalExternalModuleDependency!>! but String was expected