diff --git a/crates/aiken-lang/src/ast.rs b/crates/aiken-lang/src/ast.rs
index 2d59a8c7..2b6f0c9a 100644
--- a/crates/aiken-lang/src/ast.rs
+++ b/crates/aiken-lang/src/ast.rs
@@ -703,7 +703,7 @@ pub enum Pattern<Constructor, Type> {
     },
 
     /// A name given to a sub-pattern using the `as` keyword.
-    /// e.g. `assert #(1, [_, _] as the_list) = x`
+    /// e.g. `assert (1, [_, _] as the_list) = x`
     Assign {
         name: String,
         location: Span,
diff --git a/crates/aiken-lang/src/format.rs b/crates/aiken-lang/src/format.rs
index 716a1eff..ca5587d7 100644
--- a/crates/aiken-lang/src/format.rs
+++ b/crates/aiken-lang/src/format.rs
@@ -396,13 +396,9 @@ impl<'comments> Formatter<'comments> {
                 ..
             } => docvec![module, ".", name],
 
-            Constant::Tuple { elements, .. } => "#"
-                .to_doc()
-                .append(wrap_args(
-                    false,
-                    elements.iter().map(|e| (self.const_expr(e), false)),
-                ))
-                .group(),
+            Constant::Tuple { elements, .. } => {
+                wrap_args(false, elements.iter().map(|e| (self.const_expr(e), false))).group()
+            }
         }
     }
 
@@ -480,10 +476,9 @@ impl<'comments> Formatter<'comments> {
                 .append(break_("", " ").append(self.annotation(retrn)).nest(INDENT)),
 
             Annotation::Var { name, .. } => name.to_doc(),
-            Annotation::Tuple { elems, .. } => "#".to_doc().append(wrap_args(
-                false,
-                elems.iter().map(|t| (self.annotation(t), false)),
-            )),
+            Annotation::Tuple { elems, .. } => {
+                wrap_args(false, elems.iter().map(|t| (self.annotation(t), false)))
+            }
         }
         .group()
     }
@@ -768,13 +763,9 @@ impl<'comments> Formatter<'comments> {
                 ..
             } => self.record_update(constructor, spread, args),
 
-            UntypedExpr::Tuple { elems, .. } => "#"
-                .to_doc()
-                .append(wrap_args(
-                    false,
-                    elems.iter().map(|e| (self.wrap_expr(e), false)),
-                ))
-                .group(),
+            UntypedExpr::Tuple { elems, .. } => {
+                wrap_args(false, elems.iter().map(|e| (self.wrap_expr(e), false))).group()
+            }
 
             UntypedExpr::TupleIndex { index, tuple, .. } => {
                 let suffix = Ordinal(*index + 1).suffix().to_doc();
@@ -1500,13 +1491,9 @@ impl<'comments> Formatter<'comments> {
 
             Pattern::Discard { name, .. } => name.to_doc(),
 
-            Pattern::Tuple { elems, .. } => "#"
-                .to_doc()
-                .append(wrap_args(
-                    false,
-                    elems.iter().map(|e| (self.pattern(e), false)),
-                ))
-                .group(),
+            Pattern::Tuple { elems, .. } => {
+                wrap_args(false, elems.iter().map(|e| (self.pattern(e), false))).group()
+            }
 
             Pattern::List { elements, tail, .. } => {
                 let elements_document =
diff --git a/crates/aiken-lang/src/parser.rs b/crates/aiken-lang/src/parser.rs
index 4206104f..8eb38b3a 100644
--- a/crates/aiken-lang/src/parser.rs
+++ b/crates/aiken-lang/src/parser.rs
@@ -346,12 +346,14 @@ fn constant_value_parser() -> impl Parser<Token, ast::UntypedConstant, Error = P
                 }
             });
 
-        let constant_tuple_parser = just(Token::Hash)
-            .ignore_then(
-                r.clone()
-                    .separated_by(just(Token::Comma))
-                    .allow_trailing()
-                    .delimited_by(just(Token::LeftParen), just(Token::RightParen)),
+        let constant_tuple_parser = r
+            .clone()
+            .separated_by(just(Token::Comma))
+            .at_least(2)
+            .allow_trailing()
+            .delimited_by(
+                choice((just(Token::LeftParen), just(Token::NewLineLeftParen))),
+                just(Token::RightParen),
             )
             .map_with_span(|elements, span| ast::UntypedConstant::Tuple {
                 location: span,
@@ -897,12 +899,14 @@ pub fn expr_parser(
                 label,
             });
 
-        let tuple = just(Token::Hash)
-            .ignore_then(
-                r.clone()
-                    .separated_by(just(Token::Comma))
-                    .allow_trailing()
-                    .delimited_by(just(Token::LeftParen), just(Token::RightParen)),
+        let tuple = r
+            .clone()
+            .separated_by(just(Token::Comma))
+            .at_least(2)
+            .allow_trailing()
+            .delimited_by(
+                choice((just(Token::LeftParen), just(Token::NewLineLeftParen))),
+                just(Token::RightParen),
             )
             .map_with_span(|elems, span| expr::UntypedExpr::Tuple {
                 location: span,
@@ -1380,13 +1384,11 @@ pub fn type_parser() -> impl Parser<Token, ast::Annotation, Error = ParseError>
                 }
             }),
             // Tuple
-            just(Token::Hash)
-                .ignore_then(
-                    r.clone()
-                        .separated_by(just(Token::Comma))
-                        .allow_trailing()
-                        .delimited_by(just(Token::LeftParen), just(Token::RightParen)),
-                )
+            r.clone()
+                .separated_by(just(Token::Comma))
+                .at_least(2)
+                .allow_trailing()
+                .delimited_by(just(Token::LeftParen), just(Token::RightParen))
                 .map_with_span(|elems, span| ast::Annotation::Tuple {
                     location: span,
                     elems,
@@ -1607,13 +1609,10 @@ pub fn pattern_parser() -> impl Parser<Token, ast::UntypedPattern, Error = Parse
                     value,
                 }
             }),
-            just(Token::Hash)
-                .ignore_then(
-                    r.clone()
-                        .separated_by(just(Token::Comma))
-                        .allow_trailing()
-                        .delimited_by(just(Token::LeftParen), just(Token::RightParen)),
-                )
+            r.clone()
+                .separated_by(just(Token::Comma))
+                .allow_trailing()
+                .delimited_by(just(Token::LeftParen), just(Token::RightParen))
                 .map_with_span(|elems, span| ast::UntypedPattern::Tuple {
                     location: span,
                     elems,
diff --git a/crates/aiken-lang/src/tests/parser.rs b/crates/aiken-lang/src/tests/parser.rs
index f605339c..2038da78 100644
--- a/crates/aiken-lang/src/tests/parser.rs
+++ b/crates/aiken-lang/src/tests/parser.rs
@@ -1444,7 +1444,7 @@ fn record_create_unlabeled() {
 fn parse_tuple() {
     let code = indoc! {r#"
             fn foo() {
-              let tuple = #(1, 2, 3, 4)
+              let tuple = (1, 2, 3, 4)
               tuple.1st + tuple.2nd + tuple.3rd + tuple.4th
             }
         "#};
@@ -1454,27 +1454,27 @@ fn parse_tuple() {
         vec![ast::UntypedDefinition::Fn(Function {
             arguments: vec![],
             body: expr::UntypedExpr::Sequence {
-                location: Span::new((), 13..86),
+                location: Span::new((), 13..85),
                 expressions: vec![
                     expr::UntypedExpr::Assignment {
-                        location: Span::new((), 13..38),
+                        location: Span::new((), 13..37),
                         value: Box::new(expr::UntypedExpr::Tuple {
-                            location: Span::new((), 25..38),
+                            location: Span::new((), 25..37),
                             elems: vec![
                                 expr::UntypedExpr::Int {
-                                    location: Span::new((), 27..28),
+                                    location: Span::new((), 26..27),
                                     value: "1".to_string(),
                                 },
                                 expr::UntypedExpr::Int {
-                                    location: Span::new((), 30..31),
+                                    location: Span::new((), 29..30),
                                     value: "2".to_string(),
                                 },
                                 expr::UntypedExpr::Int {
-                                    location: Span::new((), 33..34),
+                                    location: Span::new((), 32..33),
                                     value: "3".to_string(),
                                 },
                                 expr::UntypedExpr::Int {
-                                    location: Span::new((), 36..37),
+                                    location: Span::new((), 35..36),
                                     value: "4".to_string(),
                                 },
                             ],
@@ -1487,45 +1487,45 @@ fn parse_tuple() {
                         annotation: None,
                     },
                     expr::UntypedExpr::BinOp {
-                        location: Span::new((), 41..86),
+                        location: Span::new((), 40..85),
                         name: ast::BinOp::AddInt,
                         left: Box::new(expr::UntypedExpr::BinOp {
-                            location: Span::new((), 41..74),
+                            location: Span::new((), 40..73),
                             name: ast::BinOp::AddInt,
                             left: Box::new(expr::UntypedExpr::BinOp {
-                                location: Span::new((), 41..62),
+                                location: Span::new((), 40..61),
                                 name: ast::BinOp::AddInt,
                                 left: Box::new(expr::UntypedExpr::TupleIndex {
-                                    location: Span::new((), 41..50),
+                                    location: Span::new((), 40..49),
                                     index: 0,
                                     tuple: Box::new(expr::UntypedExpr::Var {
-                                        location: Span::new((), 41..46),
+                                        location: Span::new((), 40..45),
                                         name: "tuple".to_string(),
                                     }),
                                 }),
                                 right: Box::new(expr::UntypedExpr::TupleIndex {
-                                    location: Span::new((), 53..62),
+                                    location: Span::new((), 52..61),
                                     index: 1,
                                     tuple: Box::new(expr::UntypedExpr::Var {
-                                        location: Span::new((), 53..58),
+                                        location: Span::new((), 52..57),
                                         name: "tuple".to_string(),
                                     }),
                                 }),
                             }),
                             right: Box::new(expr::UntypedExpr::TupleIndex {
-                                location: Span::new((), 65..74),
+                                location: Span::new((), 64..73),
                                 index: 2,
                                 tuple: Box::new(expr::UntypedExpr::Var {
-                                    location: Span::new((), 65..70),
+                                    location: Span::new((), 64..69),
                                     name: "tuple".to_string(),
                                 }),
                             }),
                         }),
                         right: Box::new(expr::UntypedExpr::TupleIndex {
-                            location: Span::new((), 77..86),
+                            location: Span::new((), 76..85),
                             index: 3,
                             tuple: Box::new(expr::UntypedExpr::Var {
-                                location: Span::new((), 77..82),
+                                location: Span::new((), 76..81),
                                 name: "tuple".to_string(),
                             }),
                         }),
@@ -1538,11 +1538,77 @@ fn parse_tuple() {
             public: false,
             return_annotation: None,
             return_type: (),
-            end_position: 87,
+            end_position: 86,
         })],
     )
 }
 
+#[test]
+fn parse_tuple2() {
+    let code = indoc! {r#"
+            fn foo() {
+              let a = foo(14)
+              (a, 42)
+            }
+        "#};
+
+    assert_definitions(
+        code,
+        vec![ast::UntypedDefinition::Fn(Function {
+            arguments: vec![],
+            body: expr::UntypedExpr::Sequence {
+                location: Span::new((), 13..38),
+                expressions: vec![
+                    expr::UntypedExpr::Assignment {
+                        location: Span::new((), 13..28),
+                        value: Box::new(expr::UntypedExpr::Call {
+                            arguments: vec![ast::CallArg {
+                                label: None,
+                                location: Span::new((), 25..27),
+                                value: expr::UntypedExpr::Int {
+                                    location: Span::new((), 25..27),
+                                    value: "14".to_string(),
+                                },
+                            }],
+                            fun: Box::new(expr::UntypedExpr::Var {
+                                location: Span::new((), 21..24),
+                                name: "foo".to_string(),
+                            }),
+                            location: Span::new((), 24..28),
+                        }),
+                        pattern: ast::Pattern::Var {
+                            location: Span::new((), 17..18),
+                            name: "a".to_string(),
+                        },
+                        kind: ast::AssignmentKind::Let,
+                        annotation: None,
+                    },
+                    expr::UntypedExpr::Tuple {
+                        location: Span::new((), 31..38),
+                        elems: vec![
+                            expr::UntypedExpr::Var {
+                                location: Span::new((), 32..33),
+                                name: "a".to_string(),
+                            },
+                            expr::UntypedExpr::Int {
+                                location: Span::new((), 35..37),
+                                value: "42".to_string(),
+                            },
+                        ],
+                    },
+                ],
+            },
+            doc: None,
+            location: Span::new((), 0..8),
+            name: "foo".to_string(),
+            public: false,
+            return_annotation: None,
+            return_type: (),
+            end_position: 39,
+        })],
+    );
+}
+
 #[test]
 fn plain_bytearray_literals() {
     let code = indoc! {r#"
diff --git a/crates/aiken-lang/src/tipo/pretty.rs b/crates/aiken-lang/src/tipo/pretty.rs
index c5c692ad..8dc9d29e 100644
--- a/crates/aiken-lang/src/tipo/pretty.rs
+++ b/crates/aiken-lang/src/tipo/pretty.rs
@@ -75,7 +75,7 @@ impl Printer {
 
             Type::Var { tipo: typ, .. } => self.type_var_doc(&typ.borrow()),
 
-            Type::Tuple { elems, .. } => self.args_to_aiken_doc(elems).surround("#(", ")"),
+            Type::Tuple { elems, .. } => self.args_to_aiken_doc(elems).surround("(", ")"),
         }
     }
 
diff --git a/examples/acceptance_tests/006/lib/tests.ak b/examples/acceptance_tests/006/lib/tests.ak
index 9b49e9d0..4de15698 100644
--- a/examples/acceptance_tests/006/lib/tests.ak
+++ b/examples/acceptance_tests/006/lib/tests.ak
@@ -1,3 +1,3 @@
 test foo() {
-  #(1, []) == #(1, [])
+  (1, []) == (1, [])
 }
diff --git a/examples/acceptance_tests/007/lib/tests.ak b/examples/acceptance_tests/007/lib/tests.ak
index 570c7b2f..82fc7f83 100644
--- a/examples/acceptance_tests/007/lib/tests.ak
+++ b/examples/acceptance_tests/007/lib/tests.ak
@@ -1,9 +1,9 @@
-pub fn unzip(xs: List<#(a, b)>) -> #(List<a>, List<b>) {
+pub fn unzip(xs: List<(a, b)>) -> (List<a>, List<b>) {
   when xs is {
-    [] -> #([], [])
-    [#(a, b), ..rest] -> {
-      let #(a_tail, b_tail) = unzip(rest)
-      #([a, ..a_tail], [b, ..b_tail])
+    [] -> ([], [])
+    [(a, b), ..rest] -> {
+      let (a_tail, b_tail) = unzip(rest)
+      ([a, ..a_tail], [b, ..b_tail])
     }
   }
 }
diff --git a/examples/acceptance_tests/013/lib/tests.ak b/examples/acceptance_tests/013/lib/tests.ak
index 8f0aa2bb..311de32f 100644
--- a/examples/acceptance_tests/013/lib/tests.ak
+++ b/examples/acceptance_tests/013/lib/tests.ak
@@ -1,13 +1,13 @@
-pub fn unzip(xs: List<#(a, b)>) -> #(List<a>, List<b>) {
+pub fn unzip(xs: List<(a, b)>) -> (List<a>, List<b>) {
   when xs is {
-    [] -> #([], [])
-    [#(a, b), ..rest] -> {
-      let #(a_tail, b_tail) = unzip(rest)
-      #([a, ..a_tail], [b, ..b_tail])
+    [] -> ([], [])
+    [(a, b), ..rest] -> {
+      let (a_tail, b_tail) = unzip(rest)
+      ([a, ..a_tail], [b, ..b_tail])
     }
   }
 }
 
 test unzip_1() {
-  unzip([#(1, "a"), #(2, "b")]) == #([1, 2], ["a", "b"])
+  unzip([(1, "a"), (2, "b")]) == ([1, 2], ["a", "b"])
 }
diff --git a/examples/acceptance_tests/015/lib/tests.ak b/examples/acceptance_tests/015/lib/tests.ak
index bc5b08a7..c3ba6fb3 100644
--- a/examples/acceptance_tests/015/lib/tests.ak
+++ b/examples/acceptance_tests/015/lib/tests.ak
@@ -1,5 +1,5 @@
 pub opaque type Map<key, value> {
-  inner: List<#(key, value)>,
+  inner: List<(key, value)>,
 }
 
 pub fn new() {
diff --git a/examples/acceptance_tests/016/lib/tests.ak b/examples/acceptance_tests/016/lib/tests.ak
index 38094132..9c658c82 100644
--- a/examples/acceptance_tests/016/lib/tests.ak
+++ b/examples/acceptance_tests/016/lib/tests.ak
@@ -16,4 +16,3 @@ test drop_1() {
   let x = #[1, 2, 3, 4, 5, 6, 7]
   drop(x, 2) == #[3, 4, 5, 6, 7]
 }
-
diff --git a/examples/acceptance_tests/023/lib/tests.ak b/examples/acceptance_tests/023/lib/tests.ak
index 4c8ab00f..cdafc006 100644
--- a/examples/acceptance_tests/023/lib/tests.ak
+++ b/examples/acceptance_tests/023/lib/tests.ak
@@ -1,12 +1,12 @@
 pub opaque type AssocList<key, value> {
-  inner: List<#(key, value)>,
+  inner: List<(key, value)>,
 }
 
 pub fn new() -> AssocList<key, value> {
   AssocList { inner: [] }
 }
 
-pub fn to_list(m: AssocList<key, value>) -> List<#(key, value)> {
+pub fn to_list(m: AssocList<key, value>) -> List<(key, value)> {
   m.inner
 }
 
@@ -19,17 +19,17 @@ pub fn insert(
 }
 
 fn do_insert(
-  elems: List<#(key, value)>,
+  elems: List<(key, value)>,
   k: key,
   v: value,
-) -> List<#(key, value)> {
+) -> List<(key, value)> {
   when elems is {
-    [] -> [#(k, v)]
-    [#(k2, v2), ..rest] ->
+    [] -> [(k, v)]
+    [(k2, v2), ..rest] ->
       if k == k2 {
-        [#(k, v), ..rest]
+        [(k, v), ..rest]
       } else {
-        [#(k2, v2), ..do_insert(rest, k, v)]
+        [(k2, v2), ..do_insert(rest, k, v)]
       }
   }
 }
@@ -41,5 +41,5 @@ fn fixture_1() {
 }
 
 test to_list_2() {
-  to_list(fixture_1()) == [#("foo", 42), #("bar", 14)]
+  to_list(fixture_1()) == [("foo", 42), ("bar", 14)]
 }
diff --git a/examples/acceptance_tests/024/lib/tests.ak b/examples/acceptance_tests/024/lib/tests.ak
index 5633712f..497ed5cc 100644
--- a/examples/acceptance_tests/024/lib/tests.ak
+++ b/examples/acceptance_tests/024/lib/tests.ak
@@ -14,5 +14,5 @@ pub fn map2(
 }
 
 test map2_3() {
-  map2(Some(14), Some(42), fn(a, b) { #(a, b) }) == Some(#(14, 42))
+  map2(Some(14), Some(42), fn(a, b) { (a, b) }) == Some((14, 42))
 }
diff --git a/examples/acceptance_tests/027/lib/tests.ak b/examples/acceptance_tests/027/lib/tests.ak
index 87c1a2ba..e9a33709 100644
--- a/examples/acceptance_tests/027/lib/tests.ak
+++ b/examples/acceptance_tests/027/lib/tests.ak
@@ -1,4 +1,4 @@
-pub fn foo(_a : a) -> Bool {
+pub fn foo(_a: a) -> Bool {
   True
 }
 
diff --git a/examples/acceptance_tests/029/lib/tests.ak b/examples/acceptance_tests/029/lib/tests.ak
index f1da4f1f..6d74cfac 100644
--- a/examples/acceptance_tests/029/lib/tests.ak
+++ b/examples/acceptance_tests/029/lib/tests.ak
@@ -1,19 +1,19 @@
 pub opaque type AssocList<key, value> {
-  inner: List<#(key, value)>,
+  inner: List<(key, value)>,
 }
 
 pub fn new() -> AssocList<key, value> {
   AssocList { inner: [] }
 }
 
-pub fn from_list(xs: List<#(key, value)>) -> AssocList<key, value> {
+pub fn from_list(xs: List<(key, value)>) -> AssocList<key, value> {
   AssocList { inner: do_from_list(xs) }
 }
 
-fn do_from_list(xs: List<#(key, value)>) -> List<#(key, value)> {
+fn do_from_list(xs: List<(key, value)>) -> List<(key, value)> {
   when xs is {
     [] -> []
-    [#(k, v), ..rest] -> do_insert(do_from_list(rest), k, v)
+    [(k, v), ..rest] -> do_insert(do_from_list(rest), k, v)
   }
 }
 
@@ -26,35 +26,35 @@ pub fn insert(
 }
 
 fn do_insert(
-  elems: List<#(key, value)>,
+  elems: List<(key, value)>,
   k: key,
   v: value,
-) -> List<#(key, value)> {
+) -> List<(key, value)> {
   when elems is {
-    [] -> [#(k, v)]
-    [#(k2, v2), ..rest] ->
+    [] -> [(k, v)]
+    [(k2, v2), ..rest] ->
       if k == k2 {
-        [#(k, v), ..rest]
+        [(k, v), ..rest]
       } else {
-        [#(k2, v2), ..do_insert(rest, k, v)]
+        [(k2, v2), ..do_insert(rest, k, v)]
       }
   }
 }
 
 pub fn union(
-  left left: AssocList<key, value>,
-  right right: AssocList<key, value>,
+  left: AssocList<key, value>,
+  right: AssocList<key, value>,
 ) -> AssocList<key, value> {
   AssocList { inner: do_union(left.inner, right.inner) }
 }
 
 fn do_union(
-  left: List<#(key, value)>,
-  right: List<#(key, value)>,
-) -> List<#(key, value)> {
+  left: List<(key, value)>,
+  right: List<(key, value)>,
+) -> List<(key, value)> {
   when left is {
     [] -> right
-    [#(k, v), ..rest] -> do_union(rest, do_insert(right, k, v))
+    [(k, v), ..rest] -> do_union(rest, do_insert(right, k, v))
   }
 }
 
diff --git a/examples/acceptance_tests/032/lib/tests.ak b/examples/acceptance_tests/032/lib/tests.ak
index ab4226f1..035686da 100644
--- a/examples/acceptance_tests/032/lib/tests.ak
+++ b/examples/acceptance_tests/032/lib/tests.ak
@@ -1,12 +1,10 @@
 fn is_negative(i: Int) -> Bool {
   if i < 0 {
     trace("is negative")
-
-  True
+    True
   } else {
     trace("is non-negative")
-
-  False
+    False
   }
 }
 
diff --git a/examples/acceptance_tests/033/lib/tests.ak b/examples/acceptance_tests/033/lib/tests.ak
index ff5e7696..cca7041d 100644
--- a/examples/acceptance_tests/033/lib/tests.ak
+++ b/examples/acceptance_tests/033/lib/tests.ak
@@ -1,4 +1,4 @@
 test tuple_1() {
-  let coordinates = #(14, 42)
+  let coordinates = (14, 42)
   coordinates.1st == 14 && coordinates.2nd == 42
 }
diff --git a/examples/acceptance_tests/035/lib/aiken/dict.ak b/examples/acceptance_tests/035/lib/aiken/dict.ak
index 249ba44f..9640ff8f 100644
--- a/examples/acceptance_tests/035/lib/aiken/dict.ak
+++ b/examples/acceptance_tests/035/lib/aiken/dict.ak
@@ -1,10 +1,10 @@
 /// An opaque `Dict`. The type is opaque because the module maintains some
 /// invariant, namely: there's only one occurence of a given key in the dictionnary.
 pub opaque type Dict<key, value> {
-  inner: List<#(ByteArray, value)>,
+  inner: List<(ByteArray, value)>,
 }
 
-pub fn toList(self: Dict<ByteArray, value>){
+pub fn toList(self: Dict<ByteArray, value>) {
   self.inner
 }
 
@@ -20,7 +20,7 @@ pub fn insert(
 ) -> Dict<key, value> {
   Dict {
   inner: do_insert_with(self.inner, k, v, fn(_, left, _right) { Some(left) })}
-  
+
 }
 
 pub fn union_with(
@@ -32,33 +32,33 @@ pub fn union_with(
 }
 
 fn do_union_with(
-  left: List<#(ByteArray, value)>,
-  right: List<#(ByteArray, value)>,
+  left: List<(ByteArray, value)>,
+  right: List<(ByteArray, value)>,
   with: fn(ByteArray, value, value) -> Option<value>,
-) -> List<#(ByteArray, value)> {
+) -> List<(ByteArray, value)> {
   when left is {
     [] -> right
-    [#(k, v), ..rest] ->
+    [(k, v), ..rest] ->
       do_union_with(rest, do_insert_with(right, k, v, with), with)
   }
 }
 
 fn do_insert_with(
-  self: List<#(ByteArray, value)>,
+  self: List<(ByteArray, value)>,
   key k: ByteArray,
   value v: value,
   with: fn(ByteArray, value, value) -> Option<value>,
-) -> List<#(ByteArray, value)> {
+) -> List<(ByteArray, value)> {
   when self is {
-    [] -> [#(k, v)]
-    [#(k2, v2), ..rest] ->
+    [] -> [(k, v)]
+    [(k2, v2), ..rest] ->
       if k == k2 {
         when with(k, v, v2) is {
-          Some(combined) -> [#(k, combined), ..rest]
+          Some(combined) -> [(k, combined), ..rest]
           None -> rest
         }
       } else {
-        [#(k2, v2), ..do_insert_with(rest, k, v, with)]
+        [(k2, v2), ..do_insert_with(rest, k, v, with)]
       }
   }
 }
diff --git a/examples/acceptance_tests/035/lib/tests.ak b/examples/acceptance_tests/035/lib/tests.ak
index ffb5152b..60279bab 100644
--- a/examples/acceptance_tests/035/lib/tests.ak
+++ b/examples/acceptance_tests/035/lib/tests.ak
@@ -30,18 +30,19 @@ pub fn add(left v0: Value, right v1: Value) -> Value {
     v0,
     v1,
     fn(_, a0, a1) {
-      let asset = dict.union_with(
-        a0,
-        a1,
-        fn(_, q0, q1) {
-          let q = q0 + q1
-          if q == 0 {
-            None
-          } else {
-            Some(q)
-          }
-        },
-      )
+      let asset =
+        dict.union_with(
+          a0,
+          a1,
+          fn(_, q0, q1) {
+            let q = q0 + q1
+            if q == 0 {
+              None
+            } else {
+              Some(q)
+            }
+          },
+        )
 
       when dict.toList(asset) is {
         [] -> None
diff --git a/examples/acceptance_tests/036/aiken.lock b/examples/acceptance_tests/036/aiken.lock
index f9eb850a..d9cf5aff 100644
--- a/examples/acceptance_tests/036/aiken.lock
+++ b/examples/acceptance_tests/036/aiken.lock
@@ -3,11 +3,11 @@
 
 [[requirements]]
 name = "aiken-lang/stdlib"
-version = "6b482fa00ec37fe936c93155e8c670f32288a686"
+version = "1cedbe85b7c7e9c4036d63d45cad4ced27b0d50b"
 source = "github"
 
 [[packages]]
 name = "aiken-lang/stdlib"
-version = "6b482fa00ec37fe936c93155e8c670f32288a686"
+version = "1cedbe85b7c7e9c4036d63d45cad4ced27b0d50b"
 requirements = []
 source = "github"
diff --git a/examples/acceptance_tests/036/aiken.toml b/examples/acceptance_tests/036/aiken.toml
index a87271df..bfa5d50c 100644
--- a/examples/acceptance_tests/036/aiken.toml
+++ b/examples/acceptance_tests/036/aiken.toml
@@ -2,5 +2,5 @@ name = "aiken-lang/acceptance_test_036"
 version = "0.0.0"
 
 dependencies = [
-  { name = "aiken-lang/stdlib", version = "6b482fa00ec37fe936c93155e8c670f32288a686", source = "github" },
+  { name = "aiken-lang/stdlib", version = "1cedbe85b7c7e9c4036d63d45cad4ced27b0d50b", source = "github" },
 ]
diff --git a/examples/acceptance_tests/039/lib/tests.ak b/examples/acceptance_tests/039/lib/tests.ak
index 2888def8..22b1bc55 100644
--- a/examples/acceptance_tests/039/lib/tests.ak
+++ b/examples/acceptance_tests/039/lib/tests.ak
@@ -1,60 +1,107 @@
-
-
-
-pub type Door{
+pub type Door {
   locked: Bool,
-  hinge_angle: Int 
+  hinge_angle: Int,
 }
 
-
-
-pub type Car{
+pub type Car {
   owner: ByteArray,
   wheels: Int,
   door: Door,
   vin: ByteArray,
 }
 
-
-pub fn update_owner(new_owner: ByteArray, car: Car){
-  Car{..car, owner: new_owner}
-  
+pub fn update_owner(new_owner: ByteArray, car: Car) {
+  Car { ..car, owner: new_owner }
 }
 
-pub fn update_vin(new_vin: ByteArray, car: Car){
-  Car{..car, vin: new_vin}
+pub fn update_vin(new_vin: ByteArray, car: Car) {
+  Car { ..car, vin: new_vin }
 }
 
-
-pub fn update_door_angle(new_hinge_angle: Int, car: Car){
-  Car{..car, door: Door{..car.door, hinge_angle: new_hinge_angle}}
+pub fn update_door_angle(new_hinge_angle: Int, car: Car) {
+  Car { ..car, door: Door { ..car.door, hinge_angle: new_hinge_angle } }
 }
 
-pub fn update_door_locked_and_wheels(new_locked: Bool, new_wheels: Int, car: Car){
-  Car{..car, door: Door{..car.door, locked: new_locked}, wheels: new_wheels}
-
+pub fn update_door_locked_and_wheels(
+  new_locked: Bool,
+  new_wheels: Int,
+  car: Car,
+) {
+  Car {
+    ..car,
+    door: Door { ..car.door, locked: new_locked },
+    wheels: new_wheels,
+  }
 }
 
-test update_owner1(){
-  let initial_car = Car{owner: #[], wheels: 4, vin: #[1,1,1,1,1,1,1], door: Door{locked: False, hinge_angle: 45}}
-  let final_car = Car{owner: #[244, 244, 244, 244], wheels: 4, vin: #[1,1,1,1,1,1,1], door: Door{locked: False, hinge_angle: 45}}
+test update_owner1() {
+  let initial_car =
+    Car {
+      owner: #[],
+      wheels: 4,
+      vin: #[1, 1, 1, 1, 1, 1, 1],
+      door: Door { locked: False, hinge_angle: 45 },
+    }
+  let final_car =
+    Car {
+      owner: #[244, 244, 244, 244],
+      wheels: 4,
+      vin: #[1, 1, 1, 1, 1, 1, 1],
+      door: Door { locked: False, hinge_angle: 45 },
+    }
   update_owner(#[244, 244, 244, 244], initial_car) == final_car
 }
 
-test update_vin1(){
-  let initial_car = Car{owner: #[], wheels: 4, vin: #[1,1,1,1,1,1,1], door: Door{locked: False, hinge_angle: 45}}
-  let final_car = Car{owner: #[], wheels: 4, vin: #[2,2,2,2,2,2,2,2,2], door: Door{locked: False, hinge_angle: 45}}
-  update_vin(#[2,2,2,2,2,2,2,2,2], initial_car) == final_car
+test update_vin1() {
+  let initial_car =
+    Car {
+      owner: #[],
+      wheels: 4,
+      vin: #[1, 1, 1, 1, 1, 1, 1],
+      door: Door { locked: False, hinge_angle: 45 },
+    }
+  let final_car =
+    Car {
+      owner: #[],
+      wheels: 4,
+      vin: #[2, 2, 2, 2, 2, 2, 2, 2, 2],
+      door: Door { locked: False, hinge_angle: 45 },
+    }
+  update_vin(#[2, 2, 2, 2, 2, 2, 2, 2, 2], initial_car) == final_car
 }
 
-test update_door_angle1(){
-  let initial_car = Car{owner: #[], wheels: 4, vin: #[1,1,1,1,1,1,1], door: Door{locked: False, hinge_angle: 45}}
-  let final_car = Car{owner: #[], wheels: 4, vin: #[1,1,1,1,1,1,1], door: Door{locked: False, hinge_angle: 90}}
+test update_door_angle1() {
+  let initial_car =
+    Car {
+      owner: #[],
+      wheels: 4,
+      vin: #[1, 1, 1, 1, 1, 1, 1],
+      door: Door { locked: False, hinge_angle: 45 },
+    }
+  let final_car =
+    Car {
+      owner: #[],
+      wheels: 4,
+      vin: #[1, 1, 1, 1, 1, 1, 1],
+      door: Door { locked: False, hinge_angle: 90 },
+    }
   update_door_angle(90, initial_car) == final_car
 }
 
-test update_door_locked_and_wheels1(){
-  let initial_car = Car{owner: #[], wheels: 4, vin: #[1,1,1,1,1,1,1], door: Door{locked: False, hinge_angle: 45}}
-  let final_car = Car{owner: #[], wheels: 5, vin: #[1,1,1,1,1,1,1], door: Door{locked: True, hinge_angle: 45}}
+test update_door_locked_and_wheels1() {
+  let initial_car =
+    Car {
+      owner: #[],
+      wheels: 4,
+      vin: #[1, 1, 1, 1, 1, 1, 1],
+      door: Door { locked: False, hinge_angle: 45 },
+    }
+  let final_car =
+    Car {
+      owner: #[],
+      wheels: 5,
+      vin: #[1, 1, 1, 1, 1, 1, 1],
+      door: Door { locked: True, hinge_angle: 45 },
+    }
   update_door_locked_and_wheels(True, 5, initial_car) == final_car
 }