[flang] [llvm] [mlir] [OpenMP][flang] Lowering of OpenMP custom reductions to MLIR (PR #168417)

[Tom Eccles via llvm-commits]

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@@ -3651,6 +3665,11 @@ getReductionType(lower::AbstractConverter &converter,
   const auto &name = std::get<parser::ObjectName>(decl.var.t);
   const auto &symbol = semantics::SymbolRef(*name.symbol);
   mlir::Type reductionType = converter.genType(symbol);
+
+  if (!isSimpleReductionType(reductionType))
+    TODO(converter.getCurrentLocation(),
+         "declare reduction using currently only supports trival types or "
----------------
tblah wrote:

nit
```suggestion
         "declare reduction currently only supports trival types or "
```

https://github.com/llvm/llvm-project/pull/168417