! exec cue vet schema.cue data.yaml cmp stderr expect-stderr -- frontmatter.toml -- title = "Validation" description = "" -- text.md -- Constraints can be used to validate values of concrete instances. They can be applied to CUE data, or directly to YAML or JSON. -- schema.cue -- #Language: { tag: string name: =~"^\\p{Lu}" // Must start with an uppercase letter. } languages: [...#Language] -- data.yaml -- languages: - tag: en name: English - tag: nl name: dutch - tag: no name: Norwegian -- expect-stderr -- languages.1.name: invalid value "dutch" (out of bound =~"^\\p{Lu}"): ./schema.cue:3:8 ./data.yaml:5:11