[PATCH] D77821: [Flang][OpenMP] Avoid abort when collapse clause value is negative

[Peter Klausler via Phabricator via llvm-commits]

klausler added a comment.

> As far as I can tell, the collapse argument is a `scalarIntConstantExpr` to the parser. So conceptually one could make it a `scalarPositiveIntConstantExpr` and issue an error early.

Fortran has scalar-int-constant-expr but not scalar-positive-int-constant-expr as nonterminals.

The f18 parser doesn't do any semantic checking in any case.  The various constrained nonterminals of Fortran are represented in the parse tree and checked later in expression semantics.


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https://reviews.llvm.org/D77821