I.e.
[ 25%] Building CXX object apps/heat-equation/CMakeFiles/heat-equation-stdexec.dir/heat-equation-stdexec.cpp.o
"/global/homes/w/wwei/src/nvstdpar/externals/mdspan/include/experimental/../mdspan/../experimental/__p0009_bits/dynamic_extent.hpp", line 29: warning: using-declaration ignored -- it refers to the current namespace [useless_using_declaration]
using std::dynamic_extent;
^
Remark: individual warnings can be suppressed with "--diag_suppress <warning-name>"
"/global/homes/w/wwei/src/nvstdpar/build/_deps/stdexec-src/include/stdexec/execution.hpp", line 7132: warning: statement is unreachable [code_is_unreachable]
STDEXEC_UNREACHABLE();
^
detected during instantiation of function "lambda [](auto)->auto [with <auto-1>=exec::static_thread_pool::scheduler]" at line 156 of "/global/homes/w/wwei/src/nvstdpar/apps/heat-equation/heat-equation-stdexec.cpp"