# flagLookup -- flag a symbol

## Synopsis

• Usage:
flagLookup x
• Inputs:
• x,
• Outputs:
• , whether each subsequent reference to the symbol x will result in an error message
• Consequences:
• The first use arranges for each subsequent reference to the symbol x to result in an error message. The second use cancels the arrangement. Each subsequent use toggles the state.

## Description

To get access to a flagged symbol without signalling an error, use getGlobalSymbol.

## For the programmer

The object flagLookup is .