failPrintIndicatorLine

pub fn failPrintIndicatorLine(source: []const u8, indicator_index: usize) void {
    const line_begin_index = if (std.mem.findScalarLast(u8, source[0..indicator_index], '\n')) |line_begin|
        line_begin + 1
    else
        0;
    const line_end_index = if (std.mem.findScalar(u8, source[indicator_index..], '\n')) |line_end|
        (indicator_index + line_end)
    else
        source.len;

    failPrintLine(source[line_begin_index..line_end_index]);
    for (line_begin_index..indicator_index) |_|
        failPrint(" ", .{});
    if (indicator_index >= source.len)
        failPrint("^ (end of string)\n", .{})
    else
        failPrint("^ ('\\x{x:0>2}')\n", .{source[indicator_index]});
}