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reader: treat `#!` as a line comment that continues with \

Closes #9

--- a/zuo.c

+++ b/zuo.c

@@ -1941,6 +1941,12 @@

       if (s[*_o] == ';') {

         while ((s[*_o] != '\n') && (s[*_o] != 0))

           (*_o)++;

+      } else if (s[*_o] == '#' && s[(*_o) + 1] == '!') {

+        while (((s[*_o] != '\n')

+                || (s[(*_o)-1] == '\\')

+                || ((s[(*_o)-2] == '\\') && (s[(*_o)-1] == '\r')))

+               && (s[*_o] != 0))

+          (*_o)++;

       } else if (s[*_o] == '#' && s[(*_o) + 1] == ';') {

         (*_o) += 2;

         stack = zuo_cons(zuo_cons(ZUO_IN_DISCARD_RECUR, z.o_null), stack);