Any reason why: ```fun interface Foo { ... } // th...

# language-proposals

[dave08]

Any reason why:

fun interface Foo { ... }
// this works:
data class Baz(val foo: Foo)
val baz = Baz({ ... })
// whereas this doesn't...
fun baz(foo: Foo = { ... })
// it needs to be:
fun baz(foo: Foo = Foo { })

why doesn't the compiler infer Foo as the lambda type in a default value of a function declaration?

[Sam]

“this works” — does it? Not for me 🤔 https://pl.kotl.in/Rez5aNt4o

[dave08]

Yeah, sorry, I just corrected the example...

[dave08]

It works on initialization of the object, but not as a default value, whether in constructor or in function declarations...

[Sam]

It seems there is special handling for “standalone” SAM conversions when used as function arguments… I can’t find any documentation for it, though. There’s even a named language feature +SamConversionPerArgument that is enabled by default, but again, no documentation 😞