---
name: "Builtins.Pattern_Matching_Assignment_Failure"
section: "3kaya"
platform: "linux"
package: "kaya"
version: "0.4.4-6.2"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/Builtins.Pattern_Matching_Assignment_Failure"
---

# Builtins.Pattern\_Matching\_Assignment\_Failure(3kaya)

Pattern matching assignment failed

## NAME

Builtins::Pattern\_Matching\_Assignment\_Failure - Pattern matching assignment failed

## SYNOPSIS

**Builtins::Pattern\_Matching\_Assignment\_Failure(** **)**

## DESCRIPTION

This Exception is thrown in a pattern matching assignment if the right hand side of the assignment does not match the pattern given on the left hand side.

-

   testlist = nil;\
    let cons(x,xs) = testlist; // testlist is nil, not cons

## AUTHORS

Kaya standard library by Edwin Brady, Chris Morris and others (kaya@kayalang.org). For further information see http://kayalang.org/

## LICENSE

The Kaya standard library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License (version 2.1 or any later version) as published by the Free Software Foundation.