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5.2 Shadowing

It is possible for there to be a conflict between different values for the same thing in different scopes. For example, there be might a global binding for a given variable and also a local binding in the current buffer. Whenever there is a conflict shadowing occurs, permitting only one of the values to be visible in the current environment.

The process of resolving such a conflict can be described as a search down a list of places where the value might be defined, returning the first value found. The order for the search is as follows:

1. Local values in the current buffer.
2. Mode local values in the minor modes of the current buffer, in order from the highest precedence mode to the lowest precedence mode. The order of minor modes with equal precedences is undefined.
3. Mode local values in the current buffer’s major mode.
4. Global values.