Fix warning when libcore is compiled with no_fp_fmt_parse
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@ -4,12 +4,14 @@
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use crate::ascii;
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use crate::convert::TryInto;
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use crate::error::Error;
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use crate::intrinsics;
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use crate::mem;
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use crate::ops::{Add, Mul, Sub};
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use crate::str::FromStr;
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#[cfg(not(no_fp_fmt_parse))]
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use crate::error::Error;
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// Used because the `?` operator is not allowed in a const context.
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macro_rules! try_opt {
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($e:expr) => {
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