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This article is from the FAQ, by with numerous contributions by others.

L02.1) String Literals as References

The pattern text enters and exits a char repetition. This means, that a text
may be initialized using constant strings as follows:

t: @text;
do 'hello' -> t;

Many operations involving texts, however, takes references to texts as
enter/exit parameters. This is mainly for efficiency reasons.

To allow easy invocation of such operations on string literals, the
following is also allowed:

t: ^text;
do 'hello' -> t[];

The semantics of this is, that a text object is instantiated, initialized by
the constant string, and finally assigned to the text reference.

 

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