Restrictions on Compile-Time Execution

Nim code that will be executed at compile time cannot use the following language features:

• methods
• closure iterators
• the cast operator
• reference (pointer) types
• FFI

The use of wrappers that use FFI and/or cast is also disallowed. Note that these wrappers include the ones in the standard libraries.

Some or all of these restrictions are likely to be lifted over time.