'Function LAST_VALUE does not accept the keyword IGNORE NULLS' exception thrown wrong

When parsing last_value() with over not next to the function

select a, b, concat(last_value(c ignore nulls), 'abc') over (partition by a) as last_c from t1;

ERROR: AnalysisException: Function LAST_VALUE does not accept the keyword IGNORE NULLS.

thrown instead of

ERROR: AnalysisException: Analytic function requires an OVER clause: last_value(c)

This checking is happening so early, with any syntax similar to this, regardless if its a real function or not, the same exception thrown.

For example:

select a, b, asd(last_value(c ignore nulls)) over (partition by a) as last_c from t1;