1.5. Using Directives#

Syntax#

UsingDirective = (* using_keyword: *) USING_KEYWORD
                 (* clause: *) UsingClause
                 (* for_keyword: *) FOR_KEYWORD
                 (* target: *) UsingTarget
                 (* global_keyword: *) GLOBAL_KEYWORD? (* Introduced in 0.8.13 *)
                 (* semicolon: *) SEMICOLON;

UsingClause = (* variant: *) IdentifierPath
            | (* variant: *) UsingDeconstruction; (* Introduced in 0.8.13 *)

(* Introduced in 0.8.13 *)
UsingDeconstruction = (* open_brace: *) OPEN_BRACE
                      (* symbols: *) UsingDeconstructionSymbols
                      (* close_brace: *) CLOSE_BRACE;

(* Introduced in 0.8.13 *)
UsingDeconstructionSymbols = (* item: *) UsingDeconstructionSymbol ((* separator: *) COMMA (* item: *) UsingDeconstructionSymbol)*;

(* Introduced in 0.8.13 *)
UsingDeconstructionSymbol = (* name: *) IdentifierPath
                            (* alias: *) UsingAlias?; (* Introduced in 0.8.19 *)

(* Introduced in 0.8.19 *)
UsingAlias = (* as_keyword: *) AS_KEYWORD
             (* operator: *) UsingOperator;

(* Introduced in 0.8.19 *)
UsingOperator = (* variant: *) AMPERSAND
              | (* variant: *) ASTERISK
              | (* variant: *) BANG_EQUAL
              | (* variant: *) BAR
              | (* variant: *) CARET
              | (* variant: *) EQUAL_EQUAL
              | (* variant: *) GREATER_THAN
              | (* variant: *) GREATER_THAN_EQUAL
              | (* variant: *) LESS_THAN
              | (* variant: *) LESS_THAN_EQUAL
              | (* variant: *) MINUS
              | (* variant: *) PERCENT
              | (* variant: *) PLUS
              | (* variant: *) SLASH
              | (* variant: *) TILDE;

UsingTarget = (* variant: *) TypeName
            | (* variant: *) ASTERISK;

Documentation#