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8b422006af
This enables printing, for example, the attribute value from a
mismatched predicate. Example of resultant output (here made
non-negative report value seen as sign-extended int):
```
PDL/ops.mlir:21:1: error: 'pdl.pattern' op attribute 'benefit' failed to satisfy constraint: 16-bit signless integer attribute whose value is non-negative (got -31)
pdl.pattern @rewrite_with_args : benefit(-31) {
^
```
This is primarily the mechanism and didn't change any existing
constraints. I also attempted to keep the error format as close to the
original as possible - but did notice 2 errors that were inconsistent
with the rest and updated them to be consistent.