Rustdoc keeps around documentation for crates that have been renamed or deleted

[RDambrosio016]

I am working on a decently sized workspace, and i used to have a crate, i have since deleted it, but its documentation stays around because rustdoc does not seem to delete the folders in target/doc if the actual crate has been deleted. Rustdoc should check if a dependency/crate actually exists before using its cache in the documentation process and delete it if it isn't.

Meta

rustc --version --verbose:

rustc 1.48.0-nightly (f68e08933 2020-09-19)
binary: rustc
commit-hash: f68e08933d8f519a9655934fedebbc509661b219
commit-date: 2020-09-19
host: x86_64-pc-windows-msvc
release: 1.48.0-nightly
LLVM version: 11.0

Reproducing

1: cargo init --lib test
2: cargo doc
3: rename the crate to anything else in Cargo.toml
4: cargo doc --open

[jyn514]

I don't think the workspace is related, you'd have the same issue if you renamed the crate.

[RDambrosio016]

Yup, can confirm thats the case, it works with renaming too

[jyn514]

I'm going to close this in favor of rust-lang/cargo#6783; I don't think rustdoc should be clearing documentation or keep track of state between runs. I'm happy to collaborate with cargo on a fix for this, but I don't think rustdoc can fix it in isolation.