The array to scan. This parameter is not marked 'ref' to allow temporary slices to be modified. As buf is not resized in any way, omitting the 'ref' qualifier has no effect on the result of this operation, even though it may be viewed as a side-effect.
The pattern to match against.
The number of elements that do not match pat.
Performs a linear scan of buf from [0 .. buf.length$(RP), moving all elements matching pat to the end of the sequence. The relative order of elements not matching pat will be preserved. Comparisons will be performed '=='.