Compiler error on `do concurrent` local-spec

[rouson]

Compiling commit e9145979350456e84e455c47f665e40431d6e4e2 with

fpm build --compiler flang-new --flag "-mmlir -allow-assumed-rank"

yields an epic error message that GitHub rejects as too long for including in this comment. The error disappears if the local clause at line line 201 of trainable_engine_s.F90 is removed. Otherwise, it appears that the parser panicks.