Update repr to use the attribute template
#1899
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I can't really think of a good place to put this, but it didn't really fit with the rule it currently was in.
This more or less repeats what is already said in layout.repr.alignment.intro where it explains that they are modifiers that affect a representation.
This consolidates the rules for how repr values can be combined. This adds a few previously undocumented combinations, and I think all permutations should now be covered.
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New rules:
layout.repr.attribute.introlayout.repr.attribute.syntaxlayout.repr.attribute.allowed-positionslayout.repr.attribute.duplicateslayout.repr.attribute.combinationslayout.repr.attribute.combinations.transparentlayout.repr.attribute.combinations.rustlayout.repr.attribute.combinations.primitivelayout.repr.attribute.combinations.primitive-clayout.repr.attribute.combinations.primitive-unit-onlylayout.repr.attribute.combinations.align-packedlayout.repr.attribute.combinations.align-packed-rust-or-clayout.repr.attribute.combinations.align-maxlayout.repr.attribute.combinations.packed-minlayout.repr.attribute.combinations.rust-c-dupeRenamed rules:
layout.repr.align-packedis nowlayout.repr.alignment.introlayout.repr.primitive.constraintsplit intolayout.repr.primitive.enum-onlyandlayout.repr.primitive.zero-variantlayout.repr.alignment.enumis nowlayout.repr.alignment.align-enumlayout.repr.alignment.constraint-exclusivesplit intolayout.repr.alignment.pack-transitive-alignedandlayout.repr.alignment.packed-enumlayout.repr.transparent.constraint-exclusivemoved tolayout.repr.attribute.combinations