Directive deprecated is not applicable on INPUT_FIELD_DEFINITION

[vikusku]

Hi,

The title is pretty much self explanatory. When trying to generate code from schema that had @deprecated directive on the input fields I get this error. Is it a bug or expected behaviour? If it's not a bug what is the reason behind dropping @deprecated directive support on INPUT_FIELD_DEFINITION?

Minimal graphql.schema and models to reproduce

schema {
    query: Query
}

type Query {
   getMenu(input: GetMenuInput!): Menu!
}

input GetMenuInput {
    menuID: ID @deprecated(reason: "Use `id`")
    id: ID
}

type Menu {
    id: ID!
    name: String!
}

versions

• gqlgen version - v.0.12.*
• go version - go1.16.6
• go modules

[milesich]

This library supports only FIELD_DEFINITION and ENUM_VALUE based on this declaration:

directive @deprecated(reason: String = "No longer supported") on FIELD_DEFINITION | ENUM_VALUE

There is a PR to change it.