~mna/snow unlisted

ref: b80c93389bef70627bad6a5d2db7398350b0ef65 snow/go.mod -rw-r--r-- 221 bytes
cmd/internal: add packages for command-line
pkg/compiler: add return stmt, identify missing semis and expr stmt
pkg/compiler: more parser tests
pkg/grammer: minimal ebnf, validated
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