Rust toolchain nightly-2020-06-10 causing block validation in Windows to fail.

[hansieodendaal]

Describe the bug
Commit df95cee introduced a bug in Windows builds that resulted in blocks 9182, 30335, 33923 and 34947 failing validation tests. e,g,:

2020-06-18 11:39:51.632946300 [c::bn::comms_interface::inbound_handler] WARN  Block #33923 
   (3a541cf21e19650697d8d785ba9b5f38e86868af94a7fca4adec3c3bcf93aef1) validation failed: ValidationError { source: 
   TransactionError(ValidationError("Sum of inputs and outputs did not equal sum of kernels with fees")) }

This originates from fn validate_kernel_sum(...) in aggregated_body.rs, as fn sum_kernels(...) returns the wrong result.
The problem is caused by updating Rust toolchain to nightly-2020-06-10 from nightly-2020-01-08.

To Reproduce
Steps to reproduce the behaviour:

1. Ceck out commit hash ab70a86 from development branch dated 2020/06/24 12:22:24
2. Run cargo test -p tari_core --test regression_tests

Expected behaviour
When using Rust toolchain nightly-2020-06-10 all tests should pass:

running 4 tests
test test_block_33923 ... ok
test test_block_34947 ... ok
test test_block_30335 ... ok
test test_block_9182 ... ok

Screenshots
n/a

Desktop (please complete the following information):

• Windows 10

Smartphone (please complete the following information):

• n/a

Additional context
n/a

[stringhandler]

@hansieodendaal is this still occuring?

[hansieodendaal]

Hi @mikethetike, fixed by #2035. It can be closed.