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I'm experimenting with a RAL code generator that collapses contiguous
register arrays. The generated code would resemble
pub struct RegisterBlock {
pub MY_ARRAY: [RWRegister<u32>; 3],
}
and an individual register would be addressed like
ral::read_reg!(ral::my_mod, my_inst, MY_ARRAY[1]);
This commit extends the four macros so that we can specify an array
offset. We simply need to match zero or more `[N]` patterns, where `N`
is some expression that produces an array offset. The included test case
shows that the approach should support multi-dimensional arrays.
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