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Three rules, in priority order: the Annunciation in Holy Week goes to
Easter+8; any other solemnity on a Sunday of Advent, Lent or Easter goes to
the following Monday (n. 5, which n. 60 defers to explicitly), except on Palm
Sunday or Easter Sunday; otherwise the nearest later day free of Tabula
entries 1-8.
The n. 5 Monday rule is easy to miss -- n. 60 names it only by cross
reference, and reading n. 60 alone yields a single search rule where the
sources give three.
Shaped to match Rite.t.transfer_target so a later phase wires it unchanged,
with its own step bound: Calendar's round guard bounds rounds, not one call's
internal search.
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The prior comment claimed of-nativity-vigil is 'not a distinct celebration' -
wrong: Temporal_of.named (temporal_of.ml:230) constructs it as its own
Sollemnitas-rank candidate on 24 December, a genuine contestant in
band/Precedence.resolve.
The real reason None is safe is structural, not that. The Nativity is
Tabula entry 2 (band 20); only entry 1, the Paschal Triduum (band 10),
bands lower. The Triduum's Easter-2..Easter window is confined to 20
March-25 April because Gregorian Easter never falls outside [22 March, 25
April] over the whole 1583-9999 domain (measured exhaustively in
test_computus.ml, not assumed), so it can never reach 25 December. The
Nativity therefore always keeps its own day and its vigil can never be
orphaned by a transfer or reduction.
Behaviour is unchanged: vigil_feast still returns None unconditionally.
RG 33 (EF-only) and Normae nn. 11/13 remain the reason the hook exists at
all and returns None for every other candidate.
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admit returns the empty list because disposition never returns Commemorate;
vigil_feast returns None because the OF has no vigil office that its feast's
movement could orphan -- 'of-nativity-vigil' is a Mass formulary of the
solemnity, not a separate celebration.
Both are argued from the sources rather than stubbed, and Precedence_of.rules
now assembles the four functions the kernel resolver consumes.
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An impeded solemnity transfers; every other loser is omitted for that year
('Reliquae celebrationes eo anno omittuntur').
Commemorate is never returned, and that is the rule rather than a gap: the OF
has no commemoration of a losing celebration in the EF's sense, and an
optional memorial is an election rather than a commemoration. A property over
every rank pairing asserts it, so a later edit cannot quietly introduce one.
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The Tabula dierum liturgicorum's entries 1-4, one band branch each, scaled
x10 as Precedence_ef's own table is. The Triduum is identified structurally
by Easter offset because Temporal_of emits Good Friday and Holy Saturday as
ordinary Lent week-6 ferias, leaving no slug to key on.
Holy Thursday sits at entry 2, not entry 1: the Tabula's own entry 2 runs
'a feria II ad feriam V inclusive' and the Triduum opens with an evening
Mass inside that civil day. Same granularity decision the litcal layer's L1
records on the season axis.
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