Generate nicer binding for records and lists arguments#2
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dillonkearns
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Mar 31, 2026
…ors. Found 1 new bug (finding mdgriffith#6): - Elm.Arg.aliasAs generates fresh type variable for the alias instead of the actual record type from the underlying pattern. Coverage improvements: TOTAL: 57.4% -> 60.9% Elm.Declare: 33.7% -> 54.2% (+20.5%) Elm.Arg: 55.6% -> 77.8% (+22.2%) Internal.Arg: 57.4% -> 69.8% (+12.4%) Internal.Write: 66.1% -> 71.0% 6 bugs total found by property testing: mdgriffith#1 Number type variable collision (FIXED) mdgriffith#2 Pipe + lambda parens (FIXED) mdgriffith#3 Operator multi-line indentation mdgriffith#4 Comparable type variable leak mdgriffith#5 functionReduced wrong type annotations mdgriffith#6 aliasAs wrong type for alias variable Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
dillonkearns
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Found 2 more bugs: - Finding mdgriffith#5 update: Elm.unwrapper also generates wrong type annotations (val -> unwrapped instead of Wrapper -> Int) - Finding mdgriffith#7: Elm.Op.pipeLeft with lambda absorbs <| into lambda body (\x -> x <| "hello" instead of (\x -> x) <| "hello") Coverage: 60.9% -> 62.5% Elm: 60.5% -> 64.6% Elm.Declare: 54.2% -> 63.9% (+9.7%) Elm.Op: 75.6% -> 80.5% Total bugs found: 7 mdgriffith#1 Number type variable collision (FIXED) mdgriffith#2 Pipe + lambda parens (FIXED) mdgriffith#3 Operator multi-line indentation mdgriffith#4 Comparable type variable leak mdgriffith#5 functionReduced/unwrapper wrong type annotations mdgriffith#6 aliasAs wrong type for alias variable mdgriffith#7 pipeLeft lambda not parenthesized Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
dillonkearns
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Mar 31, 2026
Found 1 new class of bugs (finding mdgriffith#8): - 19 missing type annotations across 6 different API patterns (Let.unpack, Let.fn, unwrap, Declare.value, Elm.get through alias) - elm-codegen's type inference silently fails for these patterns, producing declarations without type annotations Coverage: 62.5% -> 63.2% Total bugs found: 8 mdgriffith#1 Number type variable collision (FIXED) mdgriffith#2 Pipe + lambda parens (FIXED) mdgriffith#3 Operator multi-line indentation mdgriffith#4 Comparable type variable leak mdgriffith#5 functionReduced/unwrapper wrong type annotations mdgriffith#6 aliasAs wrong type for alias variable mdgriffith#7 pipeLeft lambda not parenthesized mdgriffith#8 Missing type annotations for multiple APIs Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
dillonkearns
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…ators. Confirmed that Elm.Op.pipeTo hits the same lambda parens bug as finding mdgriffith#2/mdgriffith#7 (internally calls functionReduced). Extensible record annotations (Type.extensible) generate correctly — `{ a | name : String }` works for both aliases and function args. List pattern matching (Elm.Arg.list, items, listRemaining) generates correct code with proper head :: tail and [first, second] patterns. Note: elm-pages --coverage stopped working after recent changes (Coverage.track not found in compiled output). Filed as DX bug. Coverage at last measurement: 63.2% total. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Generate bindings for records and lists arguments that actually take those records and lists in