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Preserve the SANY binding of SUBSET against \ and \union. - #140
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SANY assigns SUBSET precedence 10-13, so SUBSET Nat \ {0} parses
as (SUBSET Nat) \ {0} and SUBSET S \union {x} parses as
(SUBSET S) \union {x}. The Summary of TLA+ gives SUBSET precedence
8-8, the same as \, \cup, and \cap, and an overlapping range is a
syntax error. Pull request 1508 applies that table in SANY, after
which these expressions no longer parse. The parentheses record
the binding SANY has been using.
Related to tlaplus/tlaplus#1508
tlaplus/tlaplus#1508
See tlaplus/rfcs#28
tlaplus/rfcs#28
[Refactor]
Co-authored-by: Grok 4.7 <noreply@x.ai>
Signed-off-by: Markus Alexander Kuppe <github.com@lemmster.de>
lemmy
marked this pull request as ready for review
November 5, 2026 18:09
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@muenchnerkindl Please confirm the precedence order in your CM proofs and merge if correct. |
muenchnerkindl
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Nov 6, 2026
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Thanks for this, all is fine.
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SANY assigns SUBSET precedence 10-13, so SUBSET Nat \ {0} parses as (SUBSET Nat) \ {0} and SUBSET S \union {x} parses as (SUBSET S) \union {x}. The Summary of TLA+ gives SUBSET precedence 8-8, the same as , \cup, and \cap, and an overlapping range is a syntax error. Pull request 1508 applies that table in SANY, after which these expressions no longer parse. The parentheses record the binding SANY has been using.
Related to tlaplus/tlaplus#1508
tlaplus/tlaplus#1508
See tlaplus/rfcs#28
tlaplus/rfcs#28
[Refactor]