Polkadot does not build with latest rust

[ethernomad]

commit b6ea6dded60f7f0f72e937129c3204b1944dd86c (HEAD -> master, origin/master, origin/HEAD)
Author: Kian Paimani <[email protected]>
Date:   Thu Oct 8 17:10:21 2020 +0200

*** Initializing WASM build environment
info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'

  nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.49.0-nightly (3525087ad 2020-10-08)

info: checking for self-updates
info: syncing channel updates for 'stable-x86_64-unknown-linux-gnu'

  stable-x86_64-unknown-linux-gnu unchanged - rustc 1.47.0 (18bf6b4f0 2020-10-07)

info: checking for self-updates
info: component 'rust-std' for target 'wasm32-unknown-unknown' is up to date
/home/jbrown/.cargo/bin/wasm-gc

  error[E0282]: type annotations needed
      --> /home/jbrown/.cargo/git/checkouts/substrate-7e08433d4c370a21/90e8abf/primitives/arithmetic/src/fixed_point.rs:541:9
       |
  541  |                   let accuracy = P::ACCURACY.saturated_into();
       |                       ^^^^^^^^ consider giving `accuracy` a type
  ...
  1595 | / implement_fixed!(
  1596 | |     FixedI64,
  1597 | |     test_fixed_i64,
  1598 | |     i64,
  ...    |
  1601 | |     "_Fixed Point 64 bits signed, range = [-9223372036.854775808, 9223372036.854775807]_",
  1602 | | );
       | |__- in this macro invocation
       |
       = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

  error[E0282]: type annotations needed
      --> /home/jbrown/.cargo/git/checkouts/substrate-7e08433d4c370a21/90e8abf/primitives/arithmetic/src/fixed_point.rs:541:9
       |
  541  |                   let accuracy = P::ACCURACY.saturated_into();
       |                       ^^^^^^^^ consider giving `accuracy` a type
  ...
  1604 | / implement_fixed!(
  1605 | |     FixedI128,
  1606 | |     test_fixed_i128,
  1607 | |     i128,
  ...    |
  1611 | |         [-170141183460469231731.687303715884105728, 170141183460469231731.687303715884105727]_",
  1612 | | );
       | |__- in this macro invocation
       |
       = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

  error[E0282]: type annotations needed
      --> /home/jbrown/.cargo/git/checkouts/substrate-7e08433d4c370a21/90e8abf/primitives/arithmetic/src/fixed_point.rs:541:9
       |
  541  |                   let accuracy = P::ACCURACY.saturated_into();
       |                       ^^^^^^^^ consider giving `accuracy` a type
  ...
  1614 | / implement_fixed!(
  1615 | |     FixedU128,
  1616 | |     test_fixed_u128,
  1617 | |     u128,
  ...    |
  1621 | |         [0.000000000000000000, 340282366920938463463.374607431768211455]_",
  1622 | | );
       | |__- in this macro invocation
       |
       = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

  error: aborting due to 3 previous errors

  For more information about this error, try `rustc --explain E0282`.
  error: could not compile `sp-arithmetic`

[ethernomad]

Underlying Substrate issue:
paritytech/substrate#7287

[bkchr]

Don't open two issues for the same problem...