Intermittent #FileInfo errors when parsing cue about cue HOT 3 CLOSED

This is fixable if I update the BuildFile generated within an instance as follows, prior to building the instance:

	instances[0].BuildFiles[0].Encoding = build.CUE
	instances[0].BuildFiles[0].Form = build.Schema
	instances[0].BuildFiles[0].Interpretation = ""

This is because Cue short circuits here: https://github.com/cuelang/cue/blob/master/internal/filetypes/filetypes.go#L77-L80

However, by default, Form is an empty string and so evaluating does not short circuit.

This isn't so much a fix - the race condition/bug exists somewhere when parsing cue's builtin, using gob encoding.

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That was a lie, my bad! If I include packages, this transient error still exists. Packages are never included with the correct file builds to skip this short circuit: https://github.com/cuelang/cue/blob/master/internal/filetypes/filetypes.go#L77-L80.

Instead, I had to reimplement dependency resolution and file parsing to generate instances for each file (and their depencency).

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This issue has been migrated to cue-lang/cue#1043.

For more details about CUE's migration to a new home, please see cue-lang/cue#1078.

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