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coNCePTuaL programs may contain a header section that precedes the first statement in a coNCePTuaL program. The header section contains three types of declarations that affect the remainder of the program: language versioning declarations, declarations of command-line options, and backend-specific variable and function declarations.
• Language versioning: | Preventing errors caused by language changes | |
• Command-line arguments: | Setting variables from command-line arguments | |
• Backend-specific declarations: | Declaring variables and functions verbatim |