When I had the following

go.mod

module domain.com/package/path

go 1.21.7

require github.com/pelletier/go-toml v1.9.5

compiling failed with this error:

compile: invalid value "go1.21.7" for -lang: should be something like "go1.12"

After updating the go.mod line from

go 1.21.7

to

go 1.21

-- it compiled. Is this a bug in pants?

(Actually, nvm me -- that looks like a different bug. Can you file a bug and I'll take a peek?)