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8.6.2 Ambiguous conditions

attempting to position a file outside its boundaries:
REPOSITION-FILE is performed as usual: Afterwards, FILE-POSITION returns the value given to REPOSITION-FILE.
attempting to read from file positions not yet written:
End-of-file, i.e., zero characters are read and no error is reported.
file-id is invalid (INCLUDE-FILE):
An appropriate exception may be thrown, but a memory fault or other problem is more probable.
I/O exception reading or closing file-id (INCLUDE-FILE, INCLUDED):
The ior produced by the operation, that discovered the problem, is thrown.
named file cannot be opened (INCLUDED):
The ior produced by open-file is thrown.
requesting an unmapped block number:
There are no unmapped legal block numbers. On some operating systems, writing a block with a large number may overflow the file system and have an error message as consequence.
using source-id when blk is non-zero:
source-id performs its function. Typically it will give the id of the source which loaded the block. (Better ideas?)