G.assert

From GMod Wiki

Function
Syntax	assert( Boolean condition, String message ) Where is this used?
Description:
Evaluates the condition, and errors with the string if it returns false.
Returns:	String
Part of Library:	Global Functions
Realm:
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Example

Description	Errors if file.txt is blank.
Used on
Code	assert(file.Read("file.txt"), "Oops.")
Output	N/A