Change usage of backslashes:
A double-backslash now indicates that a line should be continued.
A single-backslash indicates the beginning of a parameter-list.
Currently, the parameter list following a single-backslash can
only comprise a single parameter. However, the single-backslash
more concisely indicates function currying since the following
pattern is legal:
'LAMBDA param LAMBDA', which is rewritten as
'PARAM_START param PARAM_END ->'
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