Reflection

There are several built-in functions to inspect the code during compile time.
.len on arrays and slices returns their length.
$defined(<expr>) returns true if the expression inside is defined.
$reflect(<identifier>) returns a struct containing information about the identifier, often including the following properties:
- .size: the size of the value in bytes, the stdlib provides the @sizeof(x) macro as a shorthand for $reflect(x).size.
- .alignment: the alignment of the value in bytes, the stdlib provides @alignof(x) as a shorthand.
- .qname: the qualified name of the identifier, e.g std::io::printf. The stdlib provides @qnameof(x) as a shorthand.
- .name: the base name of the identifier, e.g. printf. The stdlib provides @nameof(x) as a shorthand.
$Typeof(<expr>) returns the type of the expression.
$stringify(<expr>) returns the expression as a string.
<type>::size returns the size of a type.
<type>::align returns the alignment of a type.
<type>::name return the name of a type.