File: is_prefix.doc

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\DOC is_prefix

\TYPE {is_prefix : string -> bool}

\SYNOPSIS
Tests if an identifier has prefix status.

\DESCRIBE
Certain identifiers {c} have prefix status, meaning that combinations of the 
form {c f x} will be parsed as {c (f x)} rather than the usual {(c f) x}. The 
call {is_prefix "c"} tests if {c} is one of those identifiers.

\FAILURE
Never fails.

\SEEALSO
parse_as_prefix, prefixes, unparse_as_prefix.

\ENDDOC