Bug 4959 – std.conv.parse error "no digits seen" on string starting with zero

Test case: auto s = "0 "; auto f = parse!double(s); // std.conv.ConvError: no digits seen The problem is that when the string starts with '0', parse() skips that char to check if the next one is 'x' (to determine whether it's a hex number). When it is not a hex number, like in the example above, the zero is simply discarded.