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Clarify ambiguity about how to ask Cargo for a specific version #30144

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Dec 2, 2015
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Clarify ambiguity about how to ask Cargo for a specific version #30144

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10 changes: 7 additions & 3 deletions src/doc/book/guessing-game.md
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Expand Up @@ -357,9 +357,13 @@ Cargo uses the dependencies section to know what dependencies on external
crates you have, and what versions you require. In this case, we’ve specified version `0.3.0`,
which Cargo understands to be any release that’s compatible with this specific version.
Cargo understands [Semantic Versioning][semver], which is a standard for writing version
numbers. If we wanted to use only `0.3.0` exactly, we could use `=0.3.0`. If we
wanted to use the latest version we could use `*`; We could use a range of
versions. [Cargo’s documentation][cargodoc] contains more details.
numbers. A bare number like above is actually shorthand for `^0.3.0`,
meaning "anything compatible with 0.3.0".
If we wanted to use only `0.3.0` exactly, we could say `rand="=0.3.0"`
(note the two equal signs).
And if we wanted to use the latest version we could use `*`.
We could also use a range of versions.
[Cargo’s documentation][cargodoc] contains more details.

[semver]: http://semver.org
[cargodoc]: http://doc.crates.io/crates-io.html
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