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13ab5c5d23
closureiters.nim splits a stmt list at yield points, moving post-yield
code into a new state body. When that stmt list was inside a pragma
block like `{.cast(uncheckedAssign).}`, the new state's body was created
as a bare nkStmtList without the wrapper.
Fix: track the enclosing pragma block in the transform context, and wrap
newly-created state bodies in a copy of it when the split occurs inside
one. Added an explicit `nkPragmaBlock` case to
`transformClosureIteratorBody` that saves/restores `ctx.enclosingPragma`
around its body.
(cherry picked from commit f8e470eb57)