case '.':
			dots++
			if dots >= 2 {
				return false
			}
		}
	}
	return true
}

// ModIsPrerelease reports whether v is a prerelease version for the module with the given path.
// The caller is assumed to have checked that ModIsValid(path, vers) is true.
func ModIsPrerelease(path, vers string) bool {
	if IsToolchain(path) {
		return IsPrerelease(vers)
	}
	return semver.Prerelease(vers) != ""
}