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[flang][NFC] Restore documentation #78211

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Jan 15, 2024
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[flang][NFC] Restore documentation #78211

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6 changes: 6 additions & 0 deletions flang/docs/Extensions.md
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Expand Up @@ -107,6 +107,12 @@ end
These definitions yield fairly poor results due to floating-point
cancellation, and every Fortran compiler (including this one)
uses better algorithms.
* When an index variable of a `FORALL` or `DO CONCURRENT` is present
in the enclosing scope, and the construct does not have an explicit
type specification for its index variables, some weird restrictions
in F'2023 subclause 19.4 paragraphs 6 & 8 should apply. Since this
compiler properly scopes these names, violations of these restrictions
elicit only portability warnings by default.

## Extensions, deletions, and legacy features supported by default

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