Weird spectral parsing output

[nulltoken]

Describe the bug

Following yaml seems weirdly parsed by Spectral

To Reproduce

repro/output.openapi.yaml

openapi: 3.0.0
servers:
  - url: "https://ex-ample.com"
x-format-version: "1.0"
info:
  title: Five
  description: Issue repro 5
  contact:
    email: [email protected]
  version: 0.0.0
paths: {}
components:
  schemas:
    AModel:
      description: Yet another self descriptive explanation
      type: object
      required:
        - identifier
      properties:
        identifier:
          type: string
        a_date:
          description: a date
          type: date
          example: 2020-05-11

Run

$ yarn spectral lint repro/output.openapi.yaml -o repro/log.txt -f json -q
yarn run v1.15.2
 C:\REDACTED\node_modules\.bin\spectral lint repro/output.openapi.yaml -o repro/log.txt -f json -q
Encountered error when running rule 'valid-example' on node at path '$,components,schemas,AModel,properties,a_date':
Error: schema is invalid: data/type should be equal to one of the allowed values, data/type should be array, data/type should match some schema in
anyOf
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

repro/log.txt

[
	{
		"code": "oas3-schema",
		"path": [
			"components",
			"schemas",
			"AModel"
		],
		"message": "/components/schemas/AModel should have required property '$ref'",
		"severity": 0,
		"range": {
			"start": {
				"line": 24,
				"character": 11
			},
			"end": {
				"line": 35,
				"character": 29
			}
		},
		"source": "repro/output.openapi.yaml"
	}
]

Expected behavior

• Nothing in stderr/stdout
• Log should contain an error about unknown date type
• Log should not contain the error /components/schemas/AModel should have required property '$ref' (which wording seems a tad weird ;-) )

Environment (remove any that are not applicable):

• Library version: 4.0.1
• OS: Windows 7

[nulltoken]

Hey! Have you had the time to review/triage this?

[philsturgeon]

This should be resolved with the greater work being done in #243, but progress has halted. Valid examples are complex. I will try and get somebody to work on this soon.

[philsturgeon]

Closing as this is half #243 and half #403.