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// A hypothetical scanner class
struct _Scan {
int !x;
u8[~] buf;
new _Scan={ u8[~] b -> buf=b; };
// Skip whitespace
val skip = { ->
while( buf[x] <= ' ' )
x++;
};
val require = { u8 ch ->
skip();
buf[x++]==ch;
};
};
!_Scan !s = new _Scan(" [1,2]");
return s.require('[');
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