The built-in function
@import takes in a file,
and gives you a struct type based on that file. All declarations labelled as
pub (for public) will end up in this struct type, ready for use.
@import("std") is a special case in the compiler, and gives you access to the
standard library. Other
@imports will take in a
file path, or a package name (more on packages in a later chapter).
We will explore more of the standard library in later chapters.