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Arne Jørgensen 7d2730e317 Add support for rc and beta versions in go.mod file (#701)
* Add support for rc and beta versions in go.mod file

The regex in `parseGoVersionFile()` didn't consider rc and beta
versions. The regex has been extended.

In `findMatch()` the match is checked using `semver.satisfies()`. But
`semver.satisfies()` doesn't no about Go's non-semver rc and beta
version formats (1.16c1 instead of 1.16.0-rc.1).

We cannot use `makeSemver()` on `versionSpec` and compare the result
using `semver.satisfies()` because `versionSpec` could be, well, a
spec. Instead we first check if there is a strict match between the
candidate version and the versionSpec.

Fixes #525.

* Add support for beta versions in go.mod toolchain directive

* Support prerelease versions in the toolchain cache
2026-11-03 14:14:03 -06:00
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