USING:
Factor handbook » The language » Syntax » Parse-time word lookup » Syntax to control word lookup

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Vocabulary
syntax

Syntax

USING: vocabularies... ;

Inputs
None

Outputs
None

Word description
Adds a list of vocabularies to the search path.

Notes
If adding the vocabulary introduces ambiguity, referencing the ambiguous names will throw an ambiguous-use-error. You can disambiguate the names by prefixing them with their vocabulary name and a colon: vocabulary:word.

Errors
Throws an error if one of the vocabularies does not exist.

Examples
The following two code snippets are equivalent.

USING: math prettyprint ; 1 2 + .
3

USING: math prettyprint ; 1 2 math:+ prettyprint:.
3

See also
USE:, QUALIFIED:

Definition

USING: lexer vocabs.parser ;

IN: syntax

SYNTAX: USING: ";" [ use-vocab ] each-token ;