False positive in reporting an error?

[haochenuw]

I got red underlines that shows "use of undeclared type or module", but the code compiles with cargo build. How can this be resolved?

[timjrobinson]

I'm also seeing this too with this exact same code. This code comes from: https://doc.rust-lang.org/book/ch12-03-improving-error-handling-and-modularity.html

Rust VSCode Extension version: 0.7.8

VSCode details:

Version: 1.51.1
Commit: e5a624b788d92b8d34d1392e4c4d9789406efe8f
Date: 2020-11-10T23:31:29.624Z
Electron: 9.3.3
Chrome: 83.0.4103.122
Node.js: 12.14.1
V8: 8.3.110.13-electron.0
OS: Linux x64 5.4.0-53-generic

Rust details:

➜  minigrep git:(main) ✗ rustup --version
rustup 1.22.1 (b01adbbc3 2020-07-08)
➜  minigrep git:(main) ✗ cargo --version
cargo 1.47.0 (f3c7e066a 2020-08-28)
➜  minigrep git:(main) ✗ rustc --version
rustc 1.47.0 (18bf6b4f0 2020-10-07)