[Patch, fortran] PR20880 - Failure to detect procedures encompassing own interface

[Paul Thomas]

Grigory,

Many thanks for the prompt report. The attached regtests and cures your 
problem.  It also fixes and tests PR29976.

I propose to apply the attached, as obvious, first thing tomorrow morning:

(i) For PR20880, apply a further check that the symbol be referenced so 
that ambiguous module symbols are tolerated, unless referred to.  
Amusingly, the original PR now does not emit an error but sensible cases 
are fixed.

(ii) For PR29976, the line of code that is patched was plain wrong :-)  
The testcase is the reporter's.

Cheers

Paul
 
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