bullets: focusing operators behind +strict_bullets pragma#1017
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When `pragma +strict_bullets` is set, the bullet tokens `-`, `+`, `*` (and their repeated forms `--`, `++`, `**`, ...) become Coq-style focusing operators: each phrase's bullet is checked against a per-proof stack so that a subgoal must be discharged before its sibling is addressed, and so that bullet characters identify nesting levels. The default behavior is unchanged: without the pragma, bullets remain pure decoration, preserving every existing proof script. Repeated bullet characters are emitted by the lexer as single PLUSn/MINUSn/STARn tokens (carrying their literal), which makes them usable both as deeper bullet levels and as user-defined binary operators (`op (--) ...`). The final sibling of a split point can be continued at the parent level without a bullet: when the previous sibling is closed and exactly one sibling remains, the inner frame pops automatically (and cascades through nested last-sibling frames). This keeps the standard phl idiom of long `seq N : <post>' chains flat instead of forcing ever-deeper indentation under a `+' for each continuation. Multi-way splits keep their enumeration discipline for all but the last subgoal.
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When
pragma +strict_bulletsis set, the bullet tokens-,+,*(and their repeated forms
--,++,**, ...) become Coq-stylefocusing operators: each phrase's bullet is checked against a per-proof
stack so that a subgoal must be discharged before its sibling is
addressed, and so that bullet characters identify nesting levels. The
default behavior is unchanged: without the pragma, bullets remain pure
decoration, preserving every existing proof script.
Repeated bullet characters are emitted by the lexer as single
PLUSn/MINUSn/STARntokens (carrying their literal), which makesthem usable both as deeper bullet levels and as user-defined binary
operators (
op (--) ...).The final sibling of a split point can be continued at the parent
level without a bullet: when the previous sibling is closed and
exactly one sibling remains, the inner frame pops automatically (and
cascades through nested last-sibling frames). This keeps the standard
phl idiom of long
seq N : <post>chains flat instead of forcingever-deeper indentation under a
+for each continuation. Multi-waysplits keep their enumeration discipline for all but the last
subgoal.