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kotlinlang

Hi, i've got a good one for you :smiley: 
Can't find the right way to set the Type Parameter for an infix any ideas ?
```
class SomeHolder {

    private val someMap = mutableMapOf&lt;String,Any()&gt;


    private infix fun T String.from(transformation : (Any?)-&gt; T?) =
        transformation.invoke(someMap[this])

    fun SomeHolder.test() {
        
          //works but no return type assurance
          "test" from {input -&gt;
            when(input) {
                is String -&gt; input.toFloatOrNull()
                else -&gt; null
            }
        }

        //not working
        "otherTest" from&lt;Float&gt; { input : Any? -&gt;
            when(input) {
                is String -&gt; input.toFloatOrNull()
                else -&gt; null
            }
        }
        
        //not working
        &lt;Float&gt; "yet another" from { input : Any? -&gt;
            when(input) {
                is String -&gt; input.toFloatOrNull()
                else -&gt; null
            }
        }     
        
        //not working
        "yet another" &lt;Float&gt;from { input : Any? -&gt;
            when(input) {
                is String -&gt; input.toFloatOrNull()
                else -&gt; null
            }
        }
        
        //not working
        "arrrg" from { input : Any? -&gt;
            when(input) {
                is String -&gt; input.toFloatOrNull()
                else -&gt; null
            }
        }&lt;Float&gt;
    }

}
```

What do you mean with `no return type assurance`?

by setting the type parameter at the method (see all not working statements) it want to enforce the return type of the transformation to be a specific type

but i haven't found a way to set a TypeParameter in an inline function

i don't think its possible define the Type parameter of an infix function right now

but you can still use it like a normal function which is only a single dot added

i just wanted to point out and see if a) im doing it wrong or b) it is just not yet possible

if b) i would like to propose the my first variant from&lt;Float&gt;

and then you end up with `a +&lt;MySuperCoolClass&gt; b`

well not on operator fun that would look crazy

an operator is just a regular infix function too (with the added property of being an operator)

<https://youtrack.jetbrains.com/issue/KT-21593>