Skip error codepath on hex escape outside the surrogate range

    error: unneeded late initalization
       --> tests/../src/lexical/float.rs:173:9
        |
    173 |         let exp: u64;
        |         ^^^^^^^^^^^^^
        |
        = note: `-D clippy::needless-late-init` implied by `-D clippy::all`
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_late_init
    help: declare `exp` here
        |
    174 |         let exp: u64 = if (fp.exp == F::DENORMAL_EXPONENT) && (fp.mant & F::HIDDEN_BIT_MASK.as_u64()) == 0 {
        |         ++++++++++++++
    help: remove the assignments from the branches
        |
    175 ~             0
    176 |         } else {
    177 ~             (fp.exp + F::EXPONENT_BIAS) as u64
        |
    help: add a semicolon after the `if` expression
        |
    178 |         };
        |          +

    error: unsupported operation: can't call foreign function: getaddrinfo
        --> nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys_common/net.rs:191:21
         |
    191  |             cvt_gai(c::getaddrinfo(c_host.as_ptr(), ptr::null(), &hints, &mut res))
         |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't call foreign function: getaddrinfo
         |
         = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support