IMPORT statement
Standard: F77 F90 F95 F2003
  Example Program
IMPORT [ [ :: ] import-name [ , import-name ]... ]

The IMPORT statement is permitted only in an interface body.
The IMPORT statement imports the named entities, which may be types, named constants, variables, or procedures, into the interface body. This is particularly useful for accessing type definitions and kind parameter values from inside an interface.

If no import-name appears in the statement, all named symbols that do not have local declarations in the interface body are imported (just like host association).

A symbol that is imported and used within the interface body must be defined prior to the interface block.

INTERFACE statement, USE statement