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This is the import / export phase. This process is accomplished as follows:
a) Local definitions are created in each module. These are entered into the
local symbol table.
b) Imports to non-local modules are completely resolved.
c) Local import/export is performed via a fixpoint:
1) Export: definitions added in the previous round are filtered by the
export list and placed in a fresh export list.
2) Each module imports from the fresh export list of the other modules.
Any import not already present is placed on a new fresh export list.
When no fresh exports are generated, the iteration is complete.
d) Missing exports and imports are checked for.
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