VSCode: limit std suggestions outside tests when #![no_std] is conditional on #[cfg(test)]

[Crzyrndm]

When writing #![no_std] libraries, it is often useful to disable this for test code (the library itself is fully no_std, but allowing e.g. Vec to be easily used makes testing easier and clearer). This is done using a "conditional no_std" attribute (e.g. #![cfg_attr(not(test), no_std)])

Rust Analyzer currently doesn't handle this particularly well as it globally enables std imports and suggestions, not just inside test code

Example with conditional #![no_std]. Imports are from std even though this location is no_std

Example with unconditional #![no_std]. Imports are now from core / alloc (would be nice if outside test code the conditional version matched this)

• I was expecting this to remove all std suggestions? Str isn't exactly text I'm normally getting suggestions for when writing for no_std so this was a bit of a surprise too

PS Ignore the poorly chosen struct name, this is not inside #[cfg(test)]