"value restriction" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "langcode": "en",
          "name": "Computer science",
          "orig": "en:Computer science",
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      "examples": [
        {
          "ref": "2004, Jacques Garrigue, Relaxing the Value Restriction:",
          "text": "A typical example is an expression returning always the empty list. It should be given the polymorphic type α list, but this is not possible under the value restriction if the expression has to be evaluated.",
          "type": "quote"
        },
        {
          "ref": "2007, Geoffrey Smith, Notes on SML97's Value Restriction:",
          "text": "It has been found empirically that eta expansion usually suffices for dealing with the value restriction.",
          "type": "quote"
        }
      ],
      "glosses": [
        "In a functional language, inference of a polymorphic type only for syntactic values (values that can be evaluated at compile time) to ensure that a program is type-safe."
      ],
      "id": "en-value_restriction-en-noun-4V01urI-",
      "links": [
        [
          "computer science",
          "computer science"
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        [
          "inference",
          "type inference"
        ],
        [
          "polymorphic",
          "polymorphic"
        ],
        [
          "type-safe",
          "type-safe"
        ]
      ],
      "qualifier": "type theory",
      "raw_glosses": [
        "(computer science, type theory) In a functional language, inference of a polymorphic type only for syntactic values (values that can be evaluated at compile time) to ensure that a program is type-safe."
      ],
      "tags": [
        "uncountable"
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        "computer",
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  "word": "value restriction"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Computer science"
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      "examples": [
        {
          "ref": "2004, Jacques Garrigue, Relaxing the Value Restriction:",
          "text": "A typical example is an expression returning always the empty list. It should be given the polymorphic type α list, but this is not possible under the value restriction if the expression has to be evaluated.",
          "type": "quote"
        },
        {
          "ref": "2007, Geoffrey Smith, Notes on SML97's Value Restriction:",
          "text": "It has been found empirically that eta expansion usually suffices for dealing with the value restriction.",
          "type": "quote"
        }
      ],
      "glosses": [
        "In a functional language, inference of a polymorphic type only for syntactic values (values that can be evaluated at compile time) to ensure that a program is type-safe."
      ],
      "links": [
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          "computer science",
          "computer science"
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          "inference",
          "type inference"
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        [
          "polymorphic",
          "polymorphic"
        ],
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          "type-safe",
          "type-safe"
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      "qualifier": "type theory",
      "raw_glosses": [
        "(computer science, type theory) In a functional language, inference of a polymorphic type only for syntactic values (values that can be evaluated at compile time) to ensure that a program is type-safe."
      ],
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        "uncountable"
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        "computer",
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  "word": "value restriction"
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