Programmatic support for doctests?

[epage]

Doctests are tricky because they are creating code, and binaries, on the fly.

This is important for

• Proper unit test reporting in cargo-suity
• Code coverage reporting
• We could integrate skeptic (testing readmes) with a shipped binary, not slowing people down

[epage]

As suspected, cargo test delegates to rustdoc for doctests, populating all the hard-to-discover flags :(

https://github.com/rust-lang/cargo/blob/master/src/cargo/ops/cargo_test.rs#L129

[epage]

The core logic seems to be at https://github.com/rust-lang/rust/blob/master/src/librustdoc/test.rs#L182

[epage]

brson's work on skeptic might be reused to cover both skeptic and doctests

See https://github.com/budziq/rust-skeptic/issues/18#issuecomment-464269889

[epage]

Looks like taurplin has taken a crack at solving the doctest problem

See https://github.com/xd009642/tarpaulin/issues/13