FILE fqName:<root> fileName:/variableAsFunctionCall.kt
  FUN name:k visibility:public modality:FINAL <> ($receiver:kotlin.String) returnType:kotlin.Function0<kotlin.String> flags:
    $receiver: VALUE_PARAMETER name:<this> type:kotlin.String flags:
    BLOCK_BODY
      RETURN type=kotlin.Nothing from='k() on String: () -> String'
        BLOCK type=kotlin.Function0<kotlin.String> origin=LAMBDA
          FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> () returnType:kotlin.String flags:
            BLOCK_BODY
              RETURN type=kotlin.Nothing from='<anonymous>(): String'
                GET_VAR 'this@k: String' type=kotlin.String origin=null
          FUNCTION_REFERENCE '<anonymous>(): String' type=kotlin.Function0<kotlin.String> origin=LAMBDA
  FUN name:test1 visibility:public modality:FINAL <> (f:kotlin.Function0<kotlin.Unit>) returnType:kotlin.Unit flags:
    VALUE_PARAMETER name:f index:0 type:kotlin.Function0<kotlin.Unit> flags:
    BLOCK_BODY
      RETURN type=kotlin.Nothing from='test1(() -> Unit): Unit'
        CALL 'invoke(): R' type=kotlin.Unit origin=INVOKE
          $this: GET_VAR 'value-parameter f: () -> Unit' type=kotlin.Function0<kotlin.Unit> origin=VARIABLE_AS_FUNCTION
  FUN name:test2 visibility:public modality:FINAL <> (f:@[CALL 'constructor ExtensionFunctionType()' type=kotlin.ExtensionFunctionType origin=null] kotlin.Function1<kotlin.String, kotlin.Unit>) returnType:kotlin.Unit flags:
    VALUE_PARAMETER name:f index:0 type:@[CALL 'constructor ExtensionFunctionType()' type=kotlin.ExtensionFunctionType origin=null] kotlin.Function1<kotlin.String, kotlin.Unit> flags:
    BLOCK_BODY
      RETURN type=kotlin.Nothing from='test2(String.() -> Unit): Unit'
        CALL 'invoke(P1): R' type=kotlin.Unit origin=INVOKE
          $this: GET_VAR 'value-parameter f: String.() -> Unit' type=@[CALL 'constructor ExtensionFunctionType()' type=kotlin.ExtensionFunctionType origin=null] kotlin.Function1<kotlin.String, kotlin.Unit> origin=VARIABLE_AS_FUNCTION
          p1: CONST String type=kotlin.String value="hello"
  FUN name:test3 visibility:public modality:FINAL <> () returnType:kotlin.String flags:
    BLOCK_BODY
      RETURN type=kotlin.Nothing from='test3(): String'
        CALL 'invoke(): R' type=kotlin.String origin=null
          $this: CALL 'k() on String: () -> String' type=kotlin.Function0<kotlin.String> origin=null
            $receiver: CONST String type=kotlin.String value="hello"
  FUN name:test4 visibility:public modality:FINAL <> (ns:kotlin.String?) returnType:kotlin.String? flags:
    VALUE_PARAMETER name:ns index:0 type:kotlin.String? flags:
    BLOCK_BODY
      RETURN type=kotlin.Nothing from='test4(String?): String?'
        BLOCK type=kotlin.String? origin=SAFE_CALL
          VAR IR_TEMPORARY_VARIABLE name:tmp1_safe_receiver type:kotlin.Function0<kotlin.String>? flags:val
            BLOCK type=kotlin.Function0<kotlin.String>? origin=SAFE_CALL
              VAR IR_TEMPORARY_VARIABLE name:tmp0_safe_receiver type:kotlin.String? flags:val
                GET_VAR 'value-parameter ns: String?' type=kotlin.String? origin=null
              WHEN type=kotlin.Function0<kotlin.String>? origin=null
                BRANCH
                  if: CALL 'EQEQ(Any?, Any?): Boolean' type=kotlin.Boolean origin=EQEQ
                    arg0: GET_VAR 'tmp0_safe_receiver: String?' type=kotlin.String? origin=null
                    arg1: CONST Null type=kotlin.Nothing? value=null
                  then: CONST Null type=kotlin.Nothing? value=null
                BRANCH
                  if: CONST Boolean type=kotlin.Boolean value=true
                  then: CALL 'k() on String: () -> String' type=kotlin.Function0<kotlin.String> origin=null
                    $receiver: GET_VAR 'tmp0_safe_receiver: String?' type=kotlin.String? origin=null
          WHEN type=kotlin.String? origin=null
            BRANCH
              if: CALL 'EQEQ(Any?, Any?): Boolean' type=kotlin.Boolean origin=EQEQ
                arg0: GET_VAR 'tmp1_safe_receiver: (() -> String)?' type=kotlin.Function0<kotlin.String>? origin=null
                arg1: CONST Null type=kotlin.Nothing? value=null
              then: CONST Null type=kotlin.Nothing? value=null
            BRANCH
              if: CONST Boolean type=kotlin.Boolean value=true
              then: CALL 'invoke(): R' type=kotlin.String origin=null
                $this: GET_VAR 'tmp1_safe_receiver: (() -> String)?' type=kotlin.Function0<kotlin.String>? origin=null