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Bad oversight. Weak reverse dependencies (from imply) are not considered
if the direct dependencies of a symbol are not met (the
'if'/'depends on' dependencies from the symbol and its parents, taking
location into account if the symbol is defined in multiple places).
Caused a wrong value for the symbol FS_FAT in the U-Boot Kconfigs, where
'imply' is more heavily used compared to the kernel.
Add a new variable _direct_deps that corresponds to dir_dep from the C
implementation. Before 'imply', dir_dep was only used for a
'select'-related warning in the C implementation.
Add a bunch of tests to cover 'imply' semantics. Should be solid now.
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