peter klausler f0ffc690d5 [flang] Fix parsing of WRITE(I+J) with more accurate look-ahead ...

The parsing of I/O units uses look-ahead to discriminate between
keywords, variables and expressions as part of distinguishing internal
from external I/O.  The look-ahead was inaccurate for variables that
appear as the initial parts of expressions.

Differential Revision: https://reviews.llvm.org/D95743

2021-02-01 09:07:40 -08:00

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