2.6 The COMMON-EXTENSIONS module
assert
Statement macro
Summary
Signals an error if the expression passed to it evaluates to false.
Macro call (1)
assert expression format-string [format-arg]* => false
Macro call (2)
assert expression => false
Arguments
- expression
- A Dylan expressionbnf.
- format-string
- A Dylan expressionbnf.
- format-arg
- A Dylan expressionbnf.
Values
- false
-
#f.
Library
common-extensions
Module
common-extensions
Description
Signals an error if expression evaluates to #f.
An assertion or "assert" is a simple tool for testing that conditions hold in program code.
The format-string is a format string as defined on page 112 of the DRM. If format-string is supplied, the error is formatted accordingly, along with any instances of format-arg.
If expression is not #f, assert does not evaluate format-string or any instances of format-arg.