JVM: Fix default parameter values handling
When we generate call for 'foo', we make decision about invoking a 'foo$default' too late, after the call arguments are generated. If 'foo' was an override, and base class (interface) was generic, 'foo' in base class could have a different Kotlin and JVM signature, so the arguments we generated could be generated wrong (primitive or inline class values instead of boxes, see KT-38680). Also, we always selected first base class in supertypes list, which caused KT-15971. Look into resolved call and see if we should actually call 'foo$default' instead of 'foo' when determining actual callable. Overrides can't introduce default parameter values, and override-equivalent inherited methods with default parameters is an error in a child class. Thus, if we are calling a class member function with a default parameters, there should be one and only one overridden function that has default parameter values and overrides nothing.
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@@ -0,0 +1,15 @@
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// !LANGUAGE: +InlineClasses
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inline class IC(val s: String)
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interface IFoo<T> {
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fun foo(x: T, s: String = "K"): String
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fun bar(x: T) = foo(x)
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}
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class FooImpl : IFoo<IC> {
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override fun foo(x: IC, s: String): String = x.s + s
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}
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fun box(): String = FooImpl().bar(IC("O"))
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@@ -0,0 +1,17 @@
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// !LANGUAGE: +InlineClasses
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inline class IC(val s: String)
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interface IFoo<T> {
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fun foo(x: T, s: String = "K"): String
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}
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interface IFoo2<T> : IFoo<T> {
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fun bar(x: T) = foo(x)
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}
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class FooImpl : IFoo2<IC> {
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override fun foo(x: IC, s: String): String = x.s + s
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}
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fun box(): String = FooImpl().bar(IC("O"))
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