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spec: regression cases for with-meta nil and multi-coll map nil elements

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Document the two fixed behaviors in the contract spec: (with-meta x nil) clears
metadata, and a multi-collection map keeps nil elements (they're values, not
end-of-seq). The reader grammar (doc/grammar.ebnf) is unchanged — this session
touched semantics/stdlib, not surface syntax.
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Yogthos 2026-06-06 19:52:54 -04:00
parent 711a938943
commit d189ee2ded
2 changed files with 4 additions and 1 deletions
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test/spec/sequences-spec.janet
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@ -43,6 +43,8 @@
["map" "[2 3 4]" "(map inc [1 2 3])"]
["map two colls" "[5 7 9]" "(map + [1 2 3] [4 5 6])"]
["map stops at shortest" "[5 7]" "(map + [1 2] [4 5 6])"]
# nil elements are values, not end-of-seq: multi-coll map must not truncate.
["map keeps nil elements" "[[1 :a] [nil :b] [3 nil]]" "(map vector [1 nil 3] [:a :b nil])"]
["map-indexed" "[[0 :a] [1 :b]]" "(map-indexed vector [:a :b])"]
["mapv" "[2 3 4]" "(mapv inc [1 2 3])"]
["filter" "[2 4]" "(filter even? [1 2 3 4])"]