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core: length: Check parameter. 

* src/mes.c (length): Check parameter.
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Jan Nieuwenhuizen 2018-04-30 19:31:00 +02:00
parent 98417537a2
commit ec85612ac4
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src/mes.c
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@ -520,6 +520,8 @@ length__ (SCM x) ///((internal))
SCM
length (SCM x)
{
if (x != cell_nil && TYPE (x) != TPAIR)
error (cell_symbol_not_a_pair, x);
return MAKE_NUMBER (length__ (x));
}