let

A let declaration gives a name to a runtime immutable value.

A let can only be declared within a function.

A let declaration must have an initializer, and can have an optional type:

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let let_with_explicit_type : i32 = 42;
let let_with_type_inferred_from_initializer = 42;

There are no restrictions for the evaluation stage of the initializer of a let.

Unlike var, a let can be of a pointer type.