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Give a better error when std or core are missing #84450

Merged
merged 1 commit into from
Apr 26, 2021
Merged

Give a better error when std or core are missing #84450

merged 1 commit into from
Apr 26, 2021

Commits on Apr 25, 2021

  1. Give a better error when std or core are missing 

    - Suggest using `rustup target add` if `RUSTUP_HOME` is set. I don't know if there's any precedent for doing this, but it seems harmless enough and it will be a big help.
- Add a note about `#![no_std]` if `std` is missing but not core
- On nightly, suggest using `cargo build -Z build-std` if `CARGO` is set
- Add a note that std may be unsupported if `std` is missing but not core
- Don't suggest `#![no_std]` when the load isn't injected by the
  compiler
    @jyn514
    jyn514 committed Apr 25, 2021
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