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What is a pragma?

A pragma is a compiler directive — a hint or instruction to the compiler that affects how code is compiled, optimized, or checked, without changing the runtime logic of your program.

They use the {. .} syntax:

{.pragma_name.}

# or, with a value:
{.pragma_name: value.}

Links

Read more about pragmas here: https://nim-lang.org/docs/manual.html#pragmas