Module solana_program_runtime::stable_log 
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Stable program log messages
The format of these log messages should not be modified to avoid breaking downstream consumers of program logging
Functions
- Emit a program data.
 - Log program execution failure
 - Log a program invoke.
 - Log a message from the program itself.
 - Log return data as from the program itself. This line will not be present if no return data was set, or if the return data was set to zero length.
 - Log successful program execution.