Grammar(
    single_byte_tokens: [
        [";", "SEMI"],
        [",", "COMMA"],
        ["(", "L_PAREN"],
        [")", "R_PAREN"],
        ["{", "L_CURLY"],
        ["}", "R_CURLY"],
        ["[", "L_BRACK"],
        ["]", "R_BRACK"],
        ["<", "L_ANGLE"],
        [">", "R_ANGLE"],
        ["@", "AT"],
        ["#", "POUND"],
        ["~", "TILDE"],
        ["?", "QUESTION"],
        ["$", "DOLLAR"],
        ["&", "AMP"],
        ["|", "PIPE"],
        ["+", "PLUS"],
        ["*", "STAR"],
        ["/", "SLASH"],
        ["^", "CARET"],
        ["%", "PERCENT"],
    ],
    multi_byte_tokens: [
        [".", "DOT"],
        ["..", "DOTDOT"],
        ["...", "DOTDOTDOT"],
        ["..=", "DOTDOTEQ"],
        [":", "COLON"],
        ["::", "COLONCOLON"],
        ["=", "EQ"],
        ["==", "EQEQ"],
        ["=>", "FAT_ARROW"],
        ["!", "EXCL"],
        ["!=", "NEQ"],
        ["-", "MINUS"],
        ["->", "THIN_ARROW"],
        ["<=", "LTEQ"],
        [">=", "GTEQ"],
        ["+=", "PLUSEQ"],
        ["-=", "MINUSEQ"],
        ["&&", "AMPAMP"],
        ["||", "PIPEPIPE"],
        ["<<", "SHL"],
        [">>", "SHR"],
        ["<<=", "SHLEQ"],
        [">>=", "SHREQ"],
    ],
    keywords: [
        "use",
        "fn",
        "struct",
        "enum",
        "trait",
        "impl",
        "dyn",
        "true",
        "false",
        "as",
        "extern",
        "crate",
        "mod",
        "pub",
        "self",
        "super",
        "in",
        "where",
        "for",
        "loop",
        "while",
        "if",
        "else",
        "match",
        "const",
        "static",
        "mut",
        "unsafe",
        "type",
        "ref",
        "let",
        "move",
        "return",
    ],
    contextual_keywords: [
        "auto",
        "default",
        "union",
    ],
    tokens: [
        "ERROR",
        "IDENT",
        "UNDERSCORE",
        "WHITESPACE",
        "INT_NUMBER",
        "FLOAT_NUMBER",
        "LIFETIME",
        "CHAR",
        "BYTE",
        "STRING",
        "RAW_STRING",
        "BYTE_STRING",
        "RAW_BYTE_STRING",
        "COMMENT",
        "DOC_COMMENT",
        "SHEBANG",
    ],
    nodes: [
        "FILE",

        "STRUCT_DEF",
        "ENUM_DEF",
        "FN_DEF",
        "EXTERN_CRATE_ITEM",
        "MODULE",
        "USE_ITEM",
        "STATIC_DEF",
        "CONST_DEF",
        "TRAIT_DEF",
        "IMPL_ITEM",
        "TYPE_DEF",
        "MACRO_CALL",
        "TOKEN_TREE",

        "PAREN_TYPE",
        "TUPLE_TYPE",
        "NEVER_TYPE",
        "PATH_TYPE",
        "POINTER_TYPE",
        "ARRAY_TYPE",
        "SLICE_TYPE",
        "REFERENCE_TYPE",
        "PLACEHOLDER_TYPE",
        "FN_POINTER_TYPE",
        "FOR_TYPE",
        "IMPL_TRAIT_TYPE",
        "DYN_TRAIT_TYPE",

        "REF_PAT",
        "BIND_PAT",
        "PLACEHOLDER_PAT",
        "PATH_PAT",
        "STRUCT_PAT",
        "TUPLE_STRUCT_PAT",
        "TUPLE_PAT",
        "SLICE_PAT",
        "RANGE_PAT",

        // atoms
        "TUPLE_EXPR",
        "ARRAY_EXPR",
        "PAREN_EXPR",
        "PATH_EXPR",
        "LAMBDA_EXPR",
        "IF_EXPR",
        "WHILE_EXPR",
        "LOOP_EXPR",
        "FOR_EXPR",
        "BLOCK_EXPR",
        "RETURN_EXPR",
        "MATCH_EXPR",
        "MATCH_ARM",
        "MATCH_GUARD",
        "STRUCT_LIT",
        "STRUCT_LIT_FIELD",

        // postfix
        "CALL_EXPR",
        "INDEX_EXPR",
        "METHOD_CALL_EXPR",
        "FIELD_EXPR",
        "TRY_EXPR",
        "CAST_EXPR",

        // unary
        "REF_EXPR",
        "PREFIX_EXPR",

        "RANGE_EXPR", // just weird
        "BIN_EXPR",


        "EXTERN_BLOCK_EXPR",
        "ENUM_VARIANT",
        "NAMED_FIELD",
        "POS_FIELD",
        "ATTR",
        "META_ITEM", // not an item actually
        "USE_TREE",
        "PATH",
        "PATH_SEGMENT",
        "LITERAL",
        "ALIAS",
        "VISIBILITY",
        "WHERE_CLAUSE",
        "WHERE_PRED",
        "ABI",
        "NAME",
        "NAME_REF",

        "LET_STMT",
        "EXPR_STMT",

        "TYPE_PARAM_LIST",
        "LIFETIME_PARAM",
        "TYPE_PARAM",
        "TYPE_ARG_LIST",
        "LIFETIME_ARG",
        "TYPE_ARG",
        "ASSOC_TYPE_ARG",

        "PARAM_LIST",
        "PARAM",
        "SELF_PARAM",
        "ARG_LIST",
    ],
    ast: {
        "File": (
            collections: [
                ["functions", "FnDef"]
            ]
        ),
        "FnDef": ( traits: ["NameOwner", "AttrsOwner"] ),
        "StructDef": (
            traits: ["NameOwner", "AttrsOwner"],
            collections: [
                ["fields", "NamedField"]
            ]
        ),
        "NamedField": ( traits: ["NameOwner", "AttrsOwner"] ),
        "EnumDef": ( traits: ["NameOwner", "AttrsOwner"] ),
        "TraitDef": ( traits: ["NameOwner", "AttrsOwner"] ),
        "Module": ( traits: ["NameOwner", "AttrsOwner"] ),
        "ConstDef": ( traits: ["NameOwner", "AttrsOwner"] ),
        "StaticDef": ( traits: ["NameOwner", "AttrsOwner"] ),
        "TypeDef": ( traits: ["NameOwner", "AttrsOwner"] ),
        "ImplItem": (),

        "Name": (),
        "NameRef": (),
        "Attr": ( options: [ ["value", "TokenTree"] ] ),
        "TokenTree": (),

        "ParenType": (),
        "TupleType": (),
        "NeverType": (),
        "PathType": (),
        "PointerType": (),
        "ArrayType": (),
        "SliceType": (),
        "ReferenceType": (),
        "PlaceholderType": (),
        "FnPointerType": (),
        "ForType": (),
        "ImplTraitType": (),
        "DynTraitType": (),

        "TypeRef": ( enum: [
            "ParenType",
            "TupleType",
            "NeverType",
            "PathType",
            "PointerType",
            "ArrayType",
            "SliceType",
            "ReferenceType",
            "PlaceholderType",
            "FnPointerType",
            "ForType",
            "ImplTraitType",
            "DynTraitType",
        ]),

        "NominalDef": (
            enum: ["StructDef", "EnumDef"],
            traits: [ "AttrsOwner" ],
        ),
    },
)