Function from_graphql_parser_query_ast 

pub fn from_graphql_parser_query_ast(
    doc: &Document<'static, String>,
) -> Document<'static>

Convert a graphql_parser query Document to a libgraphql AST Document.

This is the reverse of to_graphql_parser_query_ast. The conversion is lossy in the same ways as from_graphql_parser_schema_ast.

graphql_parser does not support directives on VariableDefinition, so the resulting VariableDefinition.directives will always be empty.

Byte offsets are 0. Use from_graphql_parser_query_ast_with_source for accurate byte offsets.