EOL doesn't replace MKAY when calling a variadic function

[sjoqvist]

The following program prints 1, as expected.

HAI 1.2
  VISIBLE SUM OF 0 AN ANY OF FAIL AN WIN MKAY
KTHXBYE

However, according to the specs:

An MKAY may be omitted if it coincides with the end of the line/statement, in which case the EOL stands in for as many MKAYs as there are open variadic functions.

The way I read this, the program above should be possible to rewrite into the following.

HAI 1.2
  VISIBLE SUM OF 0 AN ANY OF FAIL AN WIN
KTHXBYE

But this quits with the error message test.lol:2: expected expression at: end of line.

Is this a bug in the specification, in the interpreter, or in my understanding of the specs?

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EDIT: The description above concerns mathematical operations, but the same goes for SMOOSH, which is mentioned on its own in the specs.

The line ending may safely implicitly close the SMOOSH operator without needing an MKAY.

The following works for me.

HAI 1.2
SMOOSH "x" AN "y" MKAY
KTHXBYE

But this doesn't (expected expression at: end of line)

HAI 1.2
SMOOSH "x" AN "y"
KTHXBYE