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632e06d3cf
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Adds Go composite literals:
T{} empty
T{1, 2} positional
T{X: 1, Y: 2} keyed
[]int{1, 2, 3} slice
[3]int{1, 2, 3} array
map[string]int{"a": 1} map
pkg.Point{1, 2} qualified
[]Point{Point{1,2}, Point{3,4}} nested
AST: (list :composite TYPE-OR-EXPR ELEMS). Each element is an
expression or (list :kv KEY VALUE).
Two parser entry points feed the same AST:
* gp-parse-primary picks up type-prefixed composites by seeing
a literal-type starter ([, map, struct) and parsing a type
first, then optionally a '{' body.
* The postfix loop picks up ident-prefixed composites — after
any base expression, '{' wraps it as a composite literal.
Known limitation flagged in plan: when statement parsing arrives,
the postfix '{' branch will misread `if cond { ... }` as a composite
literal. Standard fix: parser-mode flag suppressing composite-lit
disambiguation in control-flow expression positions. Added to plan.
Elided types in nested composites (`[][]int{{1,2},{3,4}}` with the
inner `{1,2}` typed implicitly) deferred.
parse 114/114, total 243/243.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>