Function( Function { head: Destructured( FunctionHeadDestructured { ellipsis: true, identifier: None, arguments: [ FunctionHeadDestructuredArgument { identifier: "lib", default: None, }, ], }, ), body: Map( Map { recursive: true, bindings: [ KeyValue( BindingKeyValue { from: [ Raw( PartRaw { content: "fix", span: Span { start: Position { line: 19, column: 3, }, end: Position { line: 19, column: 6, }, }, }, ), ], to: Function( Function { head: Simple( FunctionHeadSimple { identifier: "f", }, ), body: LetIn( LetIn { bindings: [ KeyValue( BindingKeyValue { from: [ Raw( PartRaw { content: "x", span: Span { start: Position { line: 19, column: 16, }, end: Position { line: 19, column: 17, }, }, }, ), ], to: FunctionApplication( FunctionApplication { function: Identifier( Identifier { id: "f", span: Span { start: Position { line: 19, column: 20, }, end: Position { line: 19, column: 21, }, }, }, ), arguments: [ Identifier( Identifier { id: "x", span: Span { start: Position { line: 19, column: 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