cmd/cue: cue def does not quote fields correctly

[rogpeppe]

What version of CUE are you using (cue version)?

v0.11.0-alpha.5

Does this issue reproduce with the latest stable release?

No, although it might have related issues.
v0.10.0 version of encoding/jsonschema doesn't use matchN.

What did you do?

exec cue def -o schema.cue jsonschema: schema.json
exec cat schema.cue
exec cue vet schema.cue data.json
-- schema.json --
{
	"$schema": "https://json-schema.org/draft/2020-12/schema",
	"type": "object",
	"properties": {
		"matchN": {
			"oneOf": [{
				"type": "string",
				"pattern": "^foo"
			}, {
				"type": "boolean"
			}]
		}
	}
}
-- data.json --
{"matchN": false}

What did you expect to see?

Passing test.

What did you see instead?

> exec cue def -o schema.cue jsonschema: schema.json
> exec cat schema.cue
[stdout]
@jsonschema(schema="https://json-schema.org/draft/2020-12/schema")
matchN?: matchN(1, [=~"^foo", bool])
...
> exec cue vet schema.cue data.json
[stderr]
matchN: cannot call non-function matchN (type bool):
    ./schema.cue:2:10
[exit status 1]
FAIL: /tmp/z.txtar:3: unexpected command failure

Note: this does not happen when using cue import: in that case, the matchN field is quoted correctly.