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Resolve compile, lint and fmt warnings #10

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@fahrradflucht fahrradflucht commented May 22, 2020

This is just a housekeeping PR:

I resolved all warnings which pop up when the project is opened using a current toolchain. Nothing really big popped up. The only thing that may be of interest is that I updated two dependencies (lazy_static and combine), these were in-range updates though. You can a detailed list of the changes I made by going over the commits, I chunked quite granular carefully.

The only big thing pending to get the project back to current is upgrading it to 2018 edition, which will require a couple of changes because async is now a reserved keyword. That's why I decided to not do it for this PR.

Happy to address any concerns. 🙂

rustdoc doesn't support generating documentation for macros. Make the
doc comments normal comments to resolve the warnings.
Update `lazy_static` depedency to the latest version to resolve
deprecation warnings for `std::sync::ONCE_INIT`.
Update `combine` dependency to the latest version to resolve clippy
warning about `ref` on an entire `let` pattern.

The upgrade introduced deprecation warnings for `combine`'s `try` method
which has been renamed due to its collision with the `try` keyword which
is reserved in Rust 2018. Resolve this as well.
Resolves `clippy::char_lit_as_u8`
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Codecov Report

Merging #10 into master will decrease coverage by 0.04%.
The diff coverage is 94.82%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
- Coverage   83.35%   83.30%   -0.05%     
==========================================
  Files           5        4       -1     
  Lines        1514     1426      -88     
==========================================
- Hits         1262     1188      -74     
+ Misses        252      238      -14     
Impacted Files Coverage Δ
src/parser.rs 88.03% <94.73%> (+0.67%) ⬆️
src/parser_unit_test.rs 87.28% <100.00%> (-0.05%) ⬇️
src/ast.rs 50.51% <0.00%> (-0.52%) ⬇️
src/lib.rs

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