[bug] Parsing of selectors with underscore is broken

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http://smalltalk.gnu.org/node/716
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http://smalltalk.gnu.org/project/comments/add/716

 Project:      GNU Smalltalk
 Version:      <none>
 Component:    STInST
 Category:     bug reports
 Priority:     normal
 Assigned to:  Unassigned
 Reported by:  zecke
 Updated by:   zecke
 Status:       active

When parsing the GemStone MontiCello definition I stumbled about two
issues:


st> STInST.RBParser parseExpression: 'self _foo'
RBAssignmentNode(self := foo)

st> STInST.RBParser parseExpression: '[:x:y | x+y]'
Object: RBParser new "<0x55913658>" error: (a #String):1: Variable name
expected
Error(Exception)>>signal (ExcHandling.st:254)
...


According to ANSI Smalltalk the '_' is reserved by the implementation.
Either we parse it or we reject it but it is certainly not an
assignment?

The other one appears to be valid according to ANSI Smalltalk.



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