Crate does no longer work with no-std on 0.7

[Luro02]

It fails with:

error[E0433]: failed to resolve: could not find `std` in the list of imported crates
  --> src\sanitizers\deduplicator.rs:74:9
   |
74 |         assert_eq!(iter.next(), Some('1'));
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ could not find `std` in the list of imported crates
   |
   = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)

(feature gating every single test with the std feature would be really annoying, especially when the std feature is disabled by default)

The macro expands in 0.7 to something like this:

{
    match (&(sanitizer.next()), &(None)) {
        (left_val, right_val) => {
            if !(*left_val == *right_val) {
                {
                    ::std::rt::begin_panic_fmt(&match match (
                        &::pretty_assertions::Comparison::new(left_val, right_val),
                    ) {
                        (arg0,) => [::core::fmt::ArgumentV1::new(
                            arg0,
                            ::core::fmt::Display::fmt,
                        )],
                    } {
                        ref args => unsafe {
                            ::core::fmt::Arguments::new_v1(
                                &["assertion failed: `(left == right)`\n\n", "\n"],
                                args,
                            )
                        },
                    })
                }
            }
        }
    }
};

Previously (0.6), it expanded to

{
    match (&(sanitizer.next()), &(None)) {
        (left_val, right_val) => {
            if !(*left_val == *right_val) {
                ::core::panicking::panic_fmt(
                    match match (&::pretty_assertions::Comparison::new(
                        left_val, right_val,
                    ),)
                    {
                        (arg0,) => [::core::fmt::ArgumentV1::new(
                            arg0,
                            ::core::fmt::Display::fmt,
                        )],
                    } {
                        ref args => unsafe {
                            ::core::fmt::Arguments::new_v1(
                                &["assertion failed: `(left == right)`\n\n", "\n"],
                                args,
                            )
                        },
                    },
                )
            }
        }
    }
};

Related issue: KokaKiwi/rust-hex#63

[tommilligan]

Hey, thanks for the report. I've put together a PR which I think should provide no_std support, as long as you still have an allocator: #83

I don't have masses of experience with no_std support - if you could verify this fix works for your use case, I'll be able to merge and release it faster. You can try out the patch with something like:

pretty_assertions = { git="https://github.com/tommilligan/rust-pretty-assertions", rev="9ba9e84d930493f0218615919ec3868c6d36f47b" }

[Luro02]

Thank you, this does work as expected

[tommilligan]

Closed as released in v1.0.0