Expected `u32`, found `usize` in lexical-core

Hey

I updated Rust but didn't change anything in my code. Suddenly I get a bunch of errors in code I didn't even write.

Most of the errors are of this type:

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:2065:27
     |
2065 |     let rs = Limb::BITS - s;
     |                           ^ expected `u32`, found `usize`

All errors:

error[E0308]: mismatched types
  --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/bhcomp.rs:62:24
   |
62 |     let bytes = bits / Limb::BITS;
   |                        ^^^^^^^^^^ expected `usize`, found `u32`

   Compiling scheduled-thread-pool v0.2.5
error[E0277]: cannot divide `usize` by `u32`
  --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/bhcomp.rs:62:22
   |
62 |     let bytes = bits / Limb::BITS;
   |                      ^ no implementation for `usize / u32`
   |
   = help: the trait `Div<u32>` is not implemented for `usize`

error[E0308]: mismatched types
   --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/bigcomp.rs:157:55
    |
157 |     let nlz = den.leading_zeros().wrapping_sub(wlz) & (u32::BITS - 1);
    |                                                       ^^^^^^^^^^^^^^^ expected `usize`, found `u32`

error[E0277]: no implementation for `usize & u32`
   --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/bigcomp.rs:157:53
    |
157 |     let nlz = den.leading_zeros().wrapping_sub(wlz) & (u32::BITS - 1);
    |                                                     ^ no implementation for `usize & u32`
    |
    = help: the trait `BitAnd<u32>` is not implemented for `usize`

error[E0308]: mismatched types
   --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/bigcomp.rs:175:40
    |
175 |         let (q, r) = shift.ceil_divmod(Limb::BITS);
    |                                        ^^^^^^^^^^ expected `usize`, found `u32`
    |
help: you can convert a `u32` to a `usize` and panic if the converted value doesn't fit
    |
175 |         let (q, r) = shift.ceil_divmod(Limb::BITS.try_into().unwrap());
    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

   Compiling backtrace v0.3.56
error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1043:42
     |
1043 |     let mut count = index.saturating_mul(Limb::BITS);
     |                                          ^^^^^^^^^^ expected `usize`, found `u32`
     |
help: you can convert a `u32` to a `usize` and panic if the converted value doesn't fit
     |
1043 |     let mut count = index.saturating_mul(Limb::BITS.try_into().unwrap());
     |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1058:28
     |
1058 |     Limb::BITS.checked_mul(x.len())
     |                            ^^^^^^^ expected `u32`, found `usize`
     |
help: you can convert a `usize` to a `u32` and panic if the converted value doesn't fit
     |
1058 |     Limb::BITS.checked_mul(x.len().try_into().unwrap())
     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1059:22
     |
1059 |         .map(|v| v - nlz)
     |                      ^^^ expected `u32`, found `usize`

error[E0277]: cannot subtract `usize` from `u32`
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1059:20
     |
1059 |         .map(|v| v - nlz)
     |                    ^ no implementation for `u32 - usize`
     |
     = help: the trait `Sub<usize>` is not implemented for `u32`

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1060:20
     |
1060 |         .unwrap_or(usize::max_value())
     |                    ^^^^^^^^^^^^^^^^^^ expected `u32`, found `usize`
     |
help: you can convert a `usize` to a `u32` and panic if the converted value doesn't fit
     |
1060 |         .unwrap_or(usize::max_value().try_into().unwrap())
     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1058:5
     |
1054 |   pub fn bit_length(x: &[Limb]) -> usize {
     |                                    ----- expected `usize` because of return type
...
1058 | /     Limb::BITS.checked_mul(x.len())
1059 | |         .map(|v| v - nlz)
1060 | |         .unwrap_or(usize::max_value())
     | |______________________________________^ expected `usize`, found `u32`
     |
help: you can convert a `u32` to a `usize` and panic if the converted value doesn't fit
     |
1058 |     Limb::BITS.checked_mul(x.len())
1059 |         .map(|v| v - nlz)
1060 |         .unwrap_or(usize::max_value()).try_into().unwrap()
     |

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1085:23
     |
1085 |     debug_assert!(n < bits && n != 0);
     |                       ^^^^ expected `usize`, found `u32`
     |
help: you can convert a `u32` to a `usize` and panic if the converted value doesn't fit
     |
1085 |     debug_assert!(n < bits.try_into().unwrap() && n != 0);
     |                       ^^^^^^^^^^^^^^^^^^^^^^^^

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1092:25
     |
1092 |     let lshift = bits - n;
     |                         ^ expected `u32`, found `usize`

error[E0277]: cannot subtract `usize` from `u32`
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1092:23
     |
1092 |     let lshift = bits - n;
     |                       ^ no implementation for `u32 - usize`
     |
     = help: the trait `Sub<usize>` is not implemented for `u32`

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1134:19
     |
1134 |     let rem = n % bits;
     |                   ^^^^ expected `usize`, found `u32`

error[E0277]: cannot mod `usize` by `u32`
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1134:17
     |
1134 |     let rem = n % bits;
     |                 ^ no implementation for `usize % u32`
     |
     = help: the trait `Rem<u32>` is not implemented for `usize`

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1135:19
     |
1135 |     let div = n / bits;
     |                   ^^^^ expected `usize`, found `u32`

error[E0277]: cannot divide `usize` by `u32`
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1135:17
     |
1135 |     let div = n / bits;
     |                 ^ no implementation for `usize / u32`
     |
     = help: the trait `Div<u32>` is not implemented for `usize`

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1191:23
     |
1191 |     debug_assert!(n < bits);
     |                       ^^^^ expected `usize`, found `u32`
     |
help: you can convert a `u32` to a `usize` and panic if the converted value doesn't fit
     |
1191 |     debug_assert!(n < bits.try_into().unwrap());
     |                       ^^^^^^^^^^^^^^^^^^^^^^^^

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1201:25
     |
1201 |     let rshift = bits - n;
     |                         ^ expected `u32`, found `usize`

error[E0277]: cannot subtract `usize` from `u32`
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1201:23
     |
1201 |     let rshift = bits - n;
     |                       ^ no implementation for `u32 - usize`
     |
     = help: the trait `Sub<usize>` is not implemented for `u32`

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1253:19
     |
1253 |     let rem = n % bits;
     |                   ^^^^ expected `usize`, found `u32`

error[E0277]: cannot mod `usize` by `u32`
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1253:17
     |
1253 |     let rem = n % bits;
     |                 ^ no implementation for `usize % u32`
     |
     = help: the trait `Rem<u32>` is not implemented for `usize`

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1254:19
     |
1254 |     let div = n / bits;
     |                   ^^^^ expected `usize`, found `u32`

error[E0277]: cannot divide `usize` by `u32`
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:1254:17
     |
1254 |     let div = n / bits;
     |                 ^ no implementation for `usize / u32`
     |
     = help: the trait `Div<u32>` is not implemented for `usize`

error[E0308]: mismatched types
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:2065:27
     |
2065 |     let rs = Limb::BITS - s;
     |                           ^ expected `u32`, found `usize`

error[E0277]: cannot subtract `usize` from `u32`
    --> /Users/niel/.cargo/registry/src/github.com-1ecc6299db9ec823/lexical-core-0.7.4/src/atof/algorithm/math.rs:2065:25
     |
2065 |     let rs = Limb::BITS - s;
     |                         ^ no implementation for `u32 - usize`
     |
     = help: the trait `Sub<usize>` is not implemented for `u32`

error: aborting due to 27 previous errors

Some errors have detailed explanations: E0277, E0308.
For more information about an error, try `rustc --explain E0277`.
error: could not compile `lexical-core`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed

I think this is an error in Rust itself or in the library lexical-core. How do I fix it?
Thanks!

1 Like

This was fixed in lexical-core 0.7.5: [BUG] Compilation Fails on Latest Nightly · Issue #55 · Alexhuszagh/rust-lexical · GitHub

You can upgrade by running:

cargo update -p lexical-core
4 Likes

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