Go: Only use EmitInvalidToolchainVersion if installed toolchain is >=1.21 && <1.23
#18499
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…`>=1.21 && <1.23`
This is reasonable because the tests use a new enough toolchain
…alled version is `1.21`
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In #15979, we added a diagnostic that warns the user if they are using Go 1.21 or above, their
go.modfile(s) do not contain an explicittoolchaindirective, and the Go language version does not match the toolchain format. This was a problem, because Go would use the language version as a fallback for the toolchain version and certaingocommands (notably downloading newer compiler versions) would fail if a language version was used as a toolchain version.However, the Go team have changed their minds about the behaviour if the language version does not match the toolchain version format.
This PR modifies the logic for emitting the diagnostic so that it is only emitted if the installed Go toolchain is in the
>= 1.21 && < 1.23version range.I did some testing and it seems that even the "problematic" versions in that range now succeed at downloading newer compilers, so we may not need this diagnostic at all, but I opted for leaving it in with the new check since it is technically wrong if one of those versions of the Go toolchain are used.