CODEWITHSUNDEEP
rustrust-cargo
alper
alper

Reputation: 3390

error: the `?` operator is not stable error when installing cargo-update

I am trying to update cargo: cargo install cargo-update, but I'm faced with the following error:

   Compiling semver-parser v0.7.0
error: the `?` operator is not stable (see issue #31436)
  --> /home/netlab/.cargo/registry/src/github.com-1ecc6299db9ec823/semver-parser-0.7.0/src/version.rs:56:26
   |
56 |     let (pre, pre_len) = common::parse_optional_meta(&s[i..], b'-')?;
   |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the `?` operator is not stable (see issue #31436)
  --> /home/netlab/.cargo/registry/src/github.com-1ecc6299db9ec823/semver-parser-0.7.0/src/version.rs:58:30
   |
58 |     let (build, build_len) = common::parse_optional_meta(&s[i..], b'+')?;
   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the `?` operator is not stable (see issue #31436)
   --> /home/netlab/.cargo/registry/src/github.com-1ecc6299db9ec823/semver-parser-0.7.0/src/range.rs:133:26
    |
133 |     let (pre, pre_len) = common::parse_optional_meta(&s[i..], b'-')?;
    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Upvotes: 1

Views: 181

Answers (1)

demonking
demonking

Reputation: 2654

It depends on your Rust version — with versions of Rust before 1.13 you will receive the error because the operator wasn't stable in these versions.

Your error message refers to a GitHub issue number.

Upvotes: 1

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