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From: Mendal@SIERRA.STANFORD.EDU (Geoff Mendal)
Newsgroups: comp.lang.ada
Subject: re: Emery's Lexical Q
Message-ID: <12336698551.30.MENDAL@Sierra.Stanford.EDU>
Date: Tue, 22-Sep-87 14:29:08 EDT
Article-I.D.: Sierra.12336698551.30.MENDAL
Posted: Tue Sep 22 14:29:08 1987
Date-Received: Thu, 24-Sep-87 05:52:49 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
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We batted Dave Emery's lexical question (... + 1:= ...) around
Stanford and came up with two interpretations:

  (1) The declaration is syntactically illegal because it requires a
      separator to distinguish between the three lexical tokens.
  (2) The declaration is syntactically legal because even though
      the colon is the replacement character for the pound sign,
      "1:=" is not itself a legal token and therefore requires
      different interpretation.

The relevant section in the LRM appears to be 2.2(2).  The question
that Emery's example poses is:

  Must a compiler try all possible reinterpretations if it finds
  a syntax error?  Or is there something inherent in the syntax
  of Ada which requires a separator in this case?

The Stanford boys are deadlocked, and different compilers give different
answers (Verdix rejects, DEC-Ada accepts), so we'd appreciate hearing
from anyone who knows the "correct" answer.

gom
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