Re: [Lilypond-auto] Issue 4342 in lilypond: Patch: Replace C++ (in)equality checks with proper SCM syntax

[lilypond]

Comment #3 on issue 4342 by address@hidden: Patch: Replace C++ (in)equality  
checks with proper SCM syntax
https://code.google.com/p/lilypond/issues/detail?id=4342

scm_is_true(x) is defined as !scm_is_false(x), so we cannot use it for  
comparison with SCM_BOOL_T.  Comparison with SCM_EOL is available in  
GUILEv1 as scm_is_null.  Comparison with SCM_UNDEFINED for better or worse  
is SCM_UNBNDP(x).

Does ly_is_exact serve a significantly different purpose than  
ly_is_rational?

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