Improved subrange error message accuracy

[Gaius Mulley]

Hi,

just a heads up, I've improved the subrange error accuracy.  Prior to
the fix this code provoked the following error messages:

$ cat badparamset2.mod
MODULE badparamset2 ;  

TYPE
   month = SET OF [1..12] ;
   day = SET OF [1..31] ;   


PROCEDURE foo (d: day) ;
BEGIN
END foo ;

VAR
   m: month ;
BEGIN
   foo (m)
END badparamset2.

$ gm2 badparamset2.mod 
badparamset2.mod:15:9: error: 1st parameter failure due to assignment 
incompatibility between actual parameter ‘m’ and the 1st formal ‘d’ parameter 
in procedure ‘foo’
   15 |    foo (m)
      |         ^
badparamset2.mod:15:9: error: subrange and subrange are incompatible as formal 
and actual procedure parameters

With the latest gcc git:


$ gm2 badparamset2.mod 
badparamset2.mod:15:9: error: 1st parameter failure due to assignment 
incompatibility between actual parameter ‘m’ and the 1st formal ‘d’ parameter 
in procedure ‘foo’
   15 |    foo (m)
      |         ^
badparamset2.mod:4:19: error: actual parameter subrange
    4 |    month = SET OF [1..12] ;
      |                   ^~~~~~~
badparamset2.mod:5:17: error: formal parameter subrange
    5 |    day = SET OF [1..31] ;
      |                 ^~~~~~~

regards,
Gaius