Sym

Used to register new symbols in the current scope.

sym entry...

entry is one of:

1. name<id>:ty<type>
2. (name<id>:ty<type>)
3. (name<id> init)
4. (name<id>:ty<type> init)

Registers symbols under the given name in the current scope.

In 1., 2., and 4., the type of symbol will be ty. In 3., it will be the type of init.

In 1. and 2., the symbol will be zero-initialized and ty must not be a constant type. In 4., init will be implicitly cast into ty.

There must not be a function, macro, special form, type, or symbol in the same scope with the same. The name must not be one of cn, *, or [].

ty must not be an undefined type.

    sym i:i32
        (f:f32)
        (b true)
        (u:u64 1);

::evaluated on name will result in an evaluated symbol being registered.

::noZero on name in 1. and 2. allows the compiler to omit zero-initialization of the symbol.