bad-macro-input ( macro -- * ) - Factor Documentation

bad-macro-input ( macro -- * )
Factor handbook » The language » Stack effect checking » Stack checker errors

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Vocabulary
stack-checker.errors

Error description
Thrown when inference encounters a combinator or macro being applied to a value which is not known at compile time. Such code needs changes before it can compile and run. See Combinator stack effects and Stack effect checking escape hatches for details.

Examples
In this example, the words being defined cannot be called, because they fail to compile with a bad-macro-input error:

: bad-example ( quot -- ) [ . ] append call ; inline : usage ( -- ) 2 2 [ + ] bad-example ;

One fix is to use compose instead of append:

: good-example ( quot -- ) [ . ] compose call ; inline : usage ( -- ) 2 2 [ + ] good-example ;

Definition

IN: stack-checker.errors

ERROR: bad-macro-input < inference-error macro ;

Methods

USING: accessors sequences stack-checker.errors summary ;

M: bad-macro-input summary
macro>> name>> "Cannot apply “"
"” to a run-time computed value" surround ;