Macros within apostrophe strings
An apostrophe string is treated by RFPP as a single indivisible item and is
not searched for special characters, digraphs, macros or macro arguments. Thus
if a macro is defined as
macro:(head:,'error in macro maxval:')
the invocation of head: will cause this message to be inserted unchanged into
the output. Note that an apostrophe string may not exceed one line. The 'case'
of characters inside an apostrophe string is not changed on output to the
Fortran.
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