IrFile /variableAsFunctionCall.kt
  IrFunction public fun kotlin.String.k(): () -> kotlin.String
    IrExpressionBody
      BLOCK type=<no-type> hasResult=false operator=null
        RETURN type=<no-type>
          DUMMY KtLambdaExpression type=() -> kotlin.String
  IrFunction public fun test1(/*0*/ f: () -> kotlin.Unit): kotlin.Unit
    IrExpressionBody
      BLOCK type=<no-type> hasResult=false operator=null
        RETURN type=<no-type>
          CALL .invoke type=kotlin.Unit operator=INVOKE
            $this: GET_VAR f type=() -> kotlin.Unit operator=VARIABLE_AS_FUNCTION
  IrFunction public fun test2(/*0*/ f: kotlin.String.() -> kotlin.Unit): kotlin.Unit
    IrExpressionBody
      BLOCK type=<no-type> hasResult=false operator=null
        RETURN type=<no-type>
          CALL .invoke type=kotlin.Unit operator=INVOKE
            $this: GET_VAR f type=kotlin.String.() -> kotlin.Unit operator=VARIABLE_AS_FUNCTION
            $receiver: CONST String type=kotlin.String value='hello'
  IrFunction public fun test3(): kotlin.String
    IrExpressionBody
      BLOCK type=<no-type> hasResult=false operator=null
        RETURN type=<no-type>
          CALL .invoke type=kotlin.String operator=null
            $this: CALL .k type=() -> kotlin.String operator=null
              $receiver: CONST String type=kotlin.String value='hello'
  IrFunction public fun test4(/*0*/ ns: kotlin.String?): kotlin.String?
    IrExpressionBody
      BLOCK type=<no-type> hasResult=false operator=null
        RETURN type=<no-type>
          BLOCK type=kotlin.String? hasResult=true operator=SAFE_CALL
            VAR val tmp0_safe_receiver: kotlin.String?
              GET_VAR ns type=kotlin.String? operator=null
            WHEN type=kotlin.String? operator=SAFE_CALL
              if: CALL .EQEQ type=kotlin.Boolean operator=EQEQ
                arg0: GET_VAR tmp0_safe_receiver type=kotlin.String? operator=null
                arg1: CONST Null type=kotlin.Nothing? value='null'
              then: CONST Null type=kotlin.Nothing? value='null'
              else: CALL .invoke type=kotlin.String operator=null
                $this: CALL .k type=() -> kotlin.String operator=null
                  $this: GET_VAR tmp0_safe_receiver type=kotlin.String? operator=null
