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Michael Kruse 2aaa5a546e [flang][msvc] Disambiguate injected class name.
The identifier `Expr` within the scope of the Expr class (including its temple specializations) refers to the current template/instantiation (see https://en.cppreference.com/w/cpp/language/injected-class-name for details). The `MapTemplate` template expect a non-instantiated template as the first template argument, not the concrete instantiation of `Expr`.

At least msvc interprets `Expr` as the injected class name, whereas gcc and clang use the global `flang::evaluate::Expr` template. Disambiguate by explicitly using the namespace.

This patch is part of the series to [[ http://lists.llvm.org/pipermail/flang-dev/2020-July/000448.html | make flang compilable with MS Visual Studio ]].

Reviewed By: DavidTruby

Differential Revision: https://reviews.llvm.org/D85646
2020-08-22 12:16:10 -05:00
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