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### 37.5 Reporting Warnings

Warnings are a facility for a program to inform the user of a possible problem, but continue running.

• Warning Basics: |  | Warnings concepts and functions to report them.
• Warning Variables: |  | Variables programs bind to customize their warnings.
• Warning Options: |  | Variables users set to control display of warnings.
• Delayed Warnings: |  | Deferring a warning until the end of a command.