Function construct_symbol_table 

pub fn construct_symbol_table(
    libraries: impl Iterator<Item = impl Deref<Target = Ast>>,
    aliases: HashMap<CompoundIdentifier, String>,
) -> Result<SymbolTable, CompilerError>

Construct a map of every key and value defined by libraries. The identifiers in the symbol table will be fully qualified, i.e. they will contain their full namespace. A symbol is namespaced according to the name of the library it is defined in. If a library defines a value by extending a previously defined key, then that value will be namespaced to the current library and not the library of its key.