diff --git a/packages/squiggle-lang/__tests__/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltInMacros_test.res b/packages/squiggle-lang/__tests__/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltInMacros_test.res
index f1acfd3a..4b506a15 100644
--- a/packages/squiggle-lang/__tests__/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltInMacros_test.res
+++ b/packages/squiggle-lang/__tests__/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltInMacros_test.res
@@ -88,17 +88,13 @@ describe("block", () => {
   )
   testMacroEval([], eBlock(list{exampleStatementY, exampleStatementZ}), "Ok({y: 1,z: 1})")
   // Block inside a block
-  testMacro(
-    [],
-    eBlock(list{eBlock(list{exampleExpression})}),
-    "Ok((:$$_bindExpression_$$ (:$$_block_$$ 1)))",
-  )
+  testMacro([], eBlock(list{eBlock(list{exampleExpression})}), "Ok((:$$_bindExpression_$$ {1}))")
   testMacroEval([], eBlock(list{eBlock(list{exampleExpression})}), "Ok(1)")
   // Block assigned to a variable
   testMacro(
     [],
     eBlock(list{eLetStatement("z", eBlock(list{eBlock(list{exampleExpressionY})}))}),
-    "Ok((:$$_bindExpression_$$ (:$_let_$ :z (:$$_block_$$ (:$$_block_$$ :y)))))",
+    "Ok((:$$_bindExpression_$$ (:$_let_$ :z {{:y}})))",
   )
   testMacroEval(
     [],
@@ -116,7 +112,7 @@ describe("block", () => {
         eSymbol("y"),
       }),
     }),
-    "Ok((:$$_bindExpression_$$ (:$$_block_$$ (:$_let_$ :y (:add :x 1)) :y)))",
+    "Ok((:$$_bindExpression_$$ {(:$_let_$ :y (:add :x 1)); :y}))",
   )
   testMacroEval(
     [("x", EvNumber(1.))],
diff --git a/packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_ToExpression_test.res b/packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_ToExpression_test.res
index 6b56b1ba..6091e6fe 100644
--- a/packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_ToExpression_test.res
+++ b/packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_ToExpression_test.res
@@ -40,111 +40,101 @@ module MyOnly = {
 describe("Peggy to Expression", () => {
   describe("literals operators parenthesis", () => {
     // Note that there is always an outer block. Otherwise, external bindings are ignrored at the first statement
-    testToExpression("1", "(:$$_block_$$ 1)", ~v="1", ())
-    testToExpression("'hello'", "(:$$_block_$$ 'hello')", ~v="'hello'", ())
-    testToExpression("true", "(:$$_block_$$ true)", ~v="true", ())
-    testToExpression("1+2", "(:$$_block_$$ (:add 1 2))", ~v="3", ())
-    testToExpression("add(1,2)", "(:$$_block_$$ (:add 1 2))", ~v="3", ())
-    testToExpression("(1)", "(:$$_block_$$ 1)", ())
-    testToExpression("(1+2)", "(:$$_block_$$ (:add 1 2))", ())
+    testToExpression("1", "{1}", ~v="1", ())
+    testToExpression("'hello'", "{'hello'}", ~v="'hello'", ())
+    testToExpression("true", "{true}", ~v="true", ())
+    testToExpression("1+2", "{(:add 1 2)}", ~v="3", ())
+    testToExpression("add(1,2)", "{(:add 1 2)}", ~v="3", ())
+    testToExpression("(1)", "{1}", ())
+    testToExpression("(1+2)", "{(:add 1 2)}", ())
   })
 
   describe("unary", () => {
-    testToExpression("-1", "(:$$_block_$$ (:unaryMinus 1))", ~v="-1", ())
-    testToExpression("!true", "(:$$_block_$$ (:not true))", ~v="false", ())
-    testToExpression("1 + -1", "(:$$_block_$$ (:add 1 (:unaryMinus 1)))", ~v="0", ())
-    testToExpression("-a[0]", "(:$$_block_$$ (:unaryMinus (:$_atIndex_$ :a 0)))", ())
+    testToExpression("-1", "{(:unaryMinus 1)}", ~v="-1", ())
+    testToExpression("!true", "{(:not true)}", ~v="false", ())
+    testToExpression("1 + -1", "{(:add 1 (:unaryMinus 1))}", ~v="0", ())
+    testToExpression("-a[0]", "{(:unaryMinus (:$_atIndex_$ :a 0))}", ())
   })
 
   describe("multi-line", () => {
-    testToExpression("x=1; 2", "(:$$_block_$$ (:$_let_$ :x (:$$_block_$$ 1)) 2)", ~v="2", ())
-    testToExpression(
-      "x=1; y=2",
-      "(:$$_block_$$ (:$_let_$ :x (:$$_block_$$ 1)) (:$_let_$ :y (:$$_block_$$ 2)))",
-      ~v="{x: 1,y: 2}",
-      (),
-    )
+    testToExpression("x=1; 2", "{(:$_let_$ :x {1}); 2}", ~v="2", ())
+    testToExpression("x=1; y=2", "{(:$_let_$ :x {1}); (:$_let_$ :y {2})}", ~v="{x: 1,y: 2}", ())
   })
 
   describe("variables", () => {
-    testToExpression("x = 1", "(:$$_block_$$ (:$_let_$ :x (:$$_block_$$ 1)))", ~v="{x: 1}", ())
-    testToExpression("x", "(:$$_block_$$ :x)", ~v=":x", ()) //TODO: value should return error
-    testToExpression("x = 1; x", "(:$$_block_$$ (:$_let_$ :x (:$$_block_$$ 1)) :x)", ~v="1", ())
+    testToExpression("x = 1", "{(:$_let_$ :x {1})}", ~v="{x: 1}", ())
+    testToExpression("x", "{:x}", ~v=":x", ()) //TODO: value should return error
+    testToExpression("x = 1; x", "{(:$_let_$ :x {1}); :x}", ~v="1", ())
   })
 
   describe("functions", () => {
     testToExpression(
       "identity(x) = x",
-      "(:$$_block_$$ (:$_let_$ :identity (:$$_lambda_$$ [x] (:$$_block_$$ :x))))",
+      "{(:$_let_$ :identity (:$$_lambda_$$ [x] {:x}))}",
       ~v="{identity: lambda(x=>internal code)}",
       (),
     ) // Function definitions become lambda assignments
-    testToExpression("identity(x)", "(:$$_block_$$ (:identity :x))", ()) // Note value returns error properly
+    testToExpression("identity(x)", "{(:identity :x)}", ()) // Note value returns error properly
     testToExpression(
       "f(x) = x> 2 ? 0 : 1; f(3)",
-      "(:$$_block_$$ (:$_let_$ :f (:$$_lambda_$$ [x] (:$$_block_$$ (:$$_ternary_$$ (:larger :x 2) 0 1)))) (:f 3))",
+      "{(:$_let_$ :f (:$$_lambda_$$ [x] {(:$$_ternary_$$ (:larger :x 2) 0 1)})); (:f 3)}",
       ~v="0",
       (),
     )
   })
 
   describe("arrays", () => {
-    testToExpression("[]", "(:$$_block_$$ (:$_constructArray_$ ()))", ~v="[]", ())
-    testToExpression("[0, 1, 2]", "(:$$_block_$$ (:$_constructArray_$ (0 1 2)))", ~v="[0,1,2]", ())
+    testToExpression("[]", "{(:$_constructArray_$ ())}", ~v="[]", ())
+    testToExpression("[0, 1, 2]", "{(:$_constructArray_$ (0 1 2))}", ~v="[0,1,2]", ())
     testToExpression(
       "['hello', 'world']",
-      "(:$$_block_$$ (:$_constructArray_$ ('hello' 'world')))",
+      "{(:$_constructArray_$ ('hello' 'world'))}",
       ~v="['hello','world']",
       (),
     )
-    testToExpression(
-      "([0,1,2])[1]",
-      "(:$$_block_$$ (:$_atIndex_$ (:$_constructArray_$ (0 1 2)) 1))",
-      ~v="1",
-      (),
-    )
+    testToExpression("([0,1,2])[1]", "{(:$_atIndex_$ (:$_constructArray_$ (0 1 2)) 1)}", ~v="1", ())
   })
 
   describe("records", () => {
     testToExpression(
       "{a: 1, b: 2}",
-      "(:$$_block_$$ (:$_constructRecord_$ (('a' 1) ('b' 2))))",
+      "{(:$_constructRecord_$ (('a' 1) ('b' 2)))}",
       ~v="{a: 1,b: 2}",
       (),
     )
     testToExpression(
       "{1+0: 1, 2+0: 2}",
-      "(:$$_block_$$ (:$_constructRecord_$ (((:add 1 0) 1) ((:add 2 0) 2))))",
+      "{(:$_constructRecord_$ (((:add 1 0) 1) ((:add 2 0) 2)))}",
       (),
     ) // key can be any expression
-    testToExpression("record.property", "(:$$_block_$$ (:$_atIndex_$ :record 'property'))", ())
+    testToExpression("record.property", "{(:$_atIndex_$ :record 'property')}", ())
     testToExpression(
       "record={property: 1}; record.property",
-      "(:$$_block_$$ (:$_let_$ :record (:$$_block_$$ (:$_constructRecord_$ (('property' 1))))) (:$_atIndex_$ :record 'property'))",
+      "{(:$_let_$ :record {(:$_constructRecord_$ (('property' 1)))}); (:$_atIndex_$ :record 'property')}",
       ~v="1",
       (),
     )
   })
 
   describe("comments", () => {
-    testToExpression("1 # This is a line comment", "(:$$_block_$$ 1)", ~v="1", ())
-    testToExpression("1 // This is a line comment", "(:$$_block_$$ 1)", ~v="1", ())
-    testToExpression("1 /* This is a multi line comment */", "(:$$_block_$$ 1)", ~v="1", ())
-    testToExpression("/* This is a multi line comment */ 1", "(:$$_block_$$ 1)", ~v="1", ())
+    testToExpression("1 # This is a line comment", "{1}", ~v="1", ())
+    testToExpression("1 // This is a line comment", "{1}", ~v="1", ())
+    testToExpression("1 /* This is a multi line comment */", "{1}", ~v="1", ())
+    testToExpression("/* This is a multi line comment */ 1", "{1}", ~v="1", ())
   })
 
   describe("ternary operator", () => {
-    testToExpression("true ? 1 : 0", "(:$$_block_$$ (:$$_ternary_$$ true 1 0))", ~v="1", ())
-    testToExpression("false ? 1 : 0", "(:$$_block_$$ (:$$_ternary_$$ false 1 0))", ~v="0", ())
+    testToExpression("true ? 1 : 0", "{(:$$_ternary_$$ true 1 0)}", ~v="1", ())
+    testToExpression("false ? 1 : 0", "{(:$$_ternary_$$ false 1 0)}", ~v="0", ())
     testToExpression(
       "true ? 1 : false ? 2 : 0",
-      "(:$$_block_$$ (:$$_ternary_$$ true 1 (:$$_ternary_$$ false 2 0)))",
+      "{(:$$_ternary_$$ true 1 (:$$_ternary_$$ false 2 0))}",
       ~v="1",
       (),
     ) // nested ternary
     testToExpression(
       "false ? 1 : false ? 2 : 0",
-      "(:$$_block_$$ (:$$_ternary_$$ false 1 (:$$_ternary_$$ false 2 0)))",
+      "{(:$$_ternary_$$ false 1 (:$$_ternary_$$ false 2 0))}",
       ~v="0",
       (),
     ) // nested ternary
@@ -152,21 +142,21 @@ describe("Peggy to Expression", () => {
       testToExpression(
         // expression binding
         "f(a) = a > 5 ? 1 : 0; f(6)",
-        "(:$$_block_$$ (:$_let_$ :f (:$$_lambda_$$ [a] (:$$_block_$$ (:$$_ternary_$$ (:larger :a 5) 1 0)))) (:f 6))",
+        "{(:$_let_$ :f (:$$_lambda_$$ [a] {(:$$_ternary_$$ (:larger :a 5) 1 0)})); (:f 6)}",
         ~v="1",
         (),
       )
       testToExpression(
         // when true binding
         "f(a) = a > 5 ? a : 0; f(6)",
-        "(:$$_block_$$ (:$_let_$ :f (:$$_lambda_$$ [a] (:$$_block_$$ (:$$_ternary_$$ (:larger :a 5) :a 0)))) (:f 6))",
+        "{(:$_let_$ :f (:$$_lambda_$$ [a] {(:$$_ternary_$$ (:larger :a 5) :a 0)})); (:f 6)}",
         ~v="6",
         (),
       )
       testToExpression(
         // when false binding
         "f(a) = a < 5 ? 1 : a; f(6)",
-        "(:$$_block_$$ (:$_let_$ :f (:$$_lambda_$$ [a] (:$$_block_$$ (:$$_ternary_$$ (:smaller :a 5) 1 :a)))) (:f 6))",
+        "{(:$_let_$ :f (:$$_lambda_$$ [a] {(:$$_ternary_$$ (:smaller :a 5) 1 :a)})); (:f 6)}",
         ~v="6",
         (),
       )
@@ -174,31 +164,23 @@ describe("Peggy to Expression", () => {
   })
 
   describe("if then else", () => {
-    testToExpression(
-      "if true then 2 else 3",
-      "(:$$_block_$$ (:$$_ternary_$$ true (:$$_block_$$ 2) (:$$_block_$$ 3)))",
-      (),
-    )
-    testToExpression(
-      "if true then {2} else {3}",
-      "(:$$_block_$$ (:$$_ternary_$$ true (:$$_block_$$ 2) (:$$_block_$$ 3)))",
-      (),
-    )
+    testToExpression("if true then 2 else 3", "{(:$$_ternary_$$ true {2} {3})}", ())
+    testToExpression("if true then {2} else {3}", "{(:$$_ternary_$$ true {2} {3})}", ())
     testToExpression(
       "if false then {2} else if false then {4} else {5}",
-      "(:$$_block_$$ (:$$_ternary_$$ false (:$$_block_$$ 2) (:$$_ternary_$$ false (:$$_block_$$ 4) (:$$_block_$$ 5))))",
+      "{(:$$_ternary_$$ false {2} (:$$_ternary_$$ false {4} {5}))}",
       (),
     ) //nested if
   })
 
   describe("pipe", () => {
-    testToExpression("1 -> add(2)", "(:$$_block_$$ (:add 1 2))", ~v="3", ())
-    testToExpression("-1 -> add(2)", "(:$$_block_$$ (:add (:unaryMinus 1) 2))", ~v="1", ()) // note that unary has higher priority naturally
-    testToExpression("1 -> add(2) * 3", "(:$$_block_$$ (:multiply (:add 1 2) 3))", ~v="9", ())
+    testToExpression("1 -> add(2)", "{(:add 1 2)}", ~v="3", ())
+    testToExpression("-1 -> add(2)", "{(:add (:unaryMinus 1) 2)}", ~v="1", ()) // note that unary has higher priority naturally
+    testToExpression("1 -> add(2) * 3", "{(:multiply (:add 1 2) 3)}", ~v="9", ())
   })
 
   describe("elixir pipe", () => {
-    testToExpression("1 |> add(2)", "(:$$_block_$$ (:add 1 2))", ~v="3", ())
+    testToExpression("1 |> add(2)", "{(:add 1 2)}", ~v="3", ())
   })
 
   // see testParse for priorities of to and credibleIntervalToDistribution
@@ -208,34 +190,29 @@ describe("Peggy to Expression", () => {
     // Like lambdas they have a local scope.
     testToExpression(
       "y=99; x={y=1; y}",
-      "(:$$_block_$$ (:$_let_$ :y (:$$_block_$$ 99)) (:$_let_$ :x (:$$_block_$$ (:$_let_$ :y (:$$_block_$$ 1)) :y)))",
+      "{(:$_let_$ :y {99}); (:$_let_$ :x {(:$_let_$ :y {1}); :y})}",
       ~v="{x: 1,y: 99}",
       (),
     )
   })
 
   describe("lambda", () => {
-    testToExpression(
-      "{|x| x}",
-      "(:$$_block_$$ (:$$_lambda_$$ [x] (:$$_block_$$ :x)))",
-      ~v="lambda(x=>internal code)",
-      (),
-    )
+    testToExpression("{|x| x}", "{(:$$_lambda_$$ [x] {:x})}", ~v="lambda(x=>internal code)", ())
     testToExpression(
       "f={|x| x}",
-      "(:$$_block_$$ (:$_let_$ :f (:$$_block_$$ (:$$_lambda_$$ [x] (:$$_block_$$ :x)))))",
+      "{(:$_let_$ :f {(:$$_lambda_$$ [x] {:x})})}",
       ~v="{f: lambda(x=>internal code)}",
       (),
     )
     testToExpression(
       "f(x)=x",
-      "(:$$_block_$$ (:$_let_$ :f (:$$_lambda_$$ [x] (:$$_block_$$ :x))))",
+      "{(:$_let_$ :f (:$$_lambda_$$ [x] {:x}))}",
       ~v="{f: lambda(x=>internal code)}",
       (),
     ) // Function definitions are lambda assignments
     testToExpression(
       "f(x)=x ? 1 : 0",
-      "(:$$_block_$$ (:$_let_$ :f (:$$_lambda_$$ [x] (:$$_block_$$ (:$$_ternary_$$ :x 1 0)))))",
+      "{(:$_let_$ :f (:$$_lambda_$$ [x] {(:$$_ternary_$$ :x 1 0)}))}",
       ~v="{f: lambda(x=>internal code)}",
       (),
     )
diff --git a/packages/squiggle-lang/__tests__/Reducer/Reducer_externalBindings_test.res b/packages/squiggle-lang/__tests__/Reducer/Reducer_externalBindings_test.res
index c47879b3..1fcd3fbf 100644
--- a/packages/squiggle-lang/__tests__/Reducer/Reducer_externalBindings_test.res
+++ b/packages/squiggle-lang/__tests__/Reducer/Reducer_externalBindings_test.res
@@ -5,7 +5,7 @@ open Reducer_TestHelpers
 describe("Eval with Bindings", () => {
   testEvalBindingsToBe("x", list{("x", ExpressionValue.EvNumber(1.))}, "Ok(1)")
   testEvalBindingsToBe("x+1", list{("x", ExpressionValue.EvNumber(1.))}, "Ok(2)")
-  testParseToBe("y = x+1; y", "Ok((:$$_block_$$ (:$_let_$ :y (:$$_block_$$ (:add :x 1))) :y))")
+  testParseToBe("y = x+1; y", "Ok({(:$_let_$ :y {(:add :x 1)}); :y})")
   testEvalBindingsToBe("y = x+1; y", list{("x", ExpressionValue.EvNumber(1.))}, "Ok(2)")
   testEvalBindingsToBe("y = x+1", list{("x", ExpressionValue.EvNumber(1.))}, "Ok({x: 1,y: 2})")
 })
diff --git a/packages/squiggle-lang/__tests__/Reducer/Reducer_functionAssignment_test.res b/packages/squiggle-lang/__tests__/Reducer/Reducer_functionAssignment_test.res
index 0f280265..30725cfe 100644
--- a/packages/squiggle-lang/__tests__/Reducer/Reducer_functionAssignment_test.res
+++ b/packages/squiggle-lang/__tests__/Reducer/Reducer_functionAssignment_test.res
@@ -2,11 +2,8 @@ open Jest
 open Reducer_TestHelpers
 
 describe("Parse function assignment", () => {
-  testParseToBe("f(x)=x", "Ok((:$$_block_$$ (:$_let_$ :f (:$$_lambda_$$ [x] (:$$_block_$$ :x)))))")
-  testParseToBe(
-    "f(x)=2*x",
-    "Ok((:$$_block_$$ (:$_let_$ :f (:$$_lambda_$$ [x] (:$$_block_$$ (:multiply 2 :x))))))",
-  )
+  testParseToBe("f(x)=x", "Ok({(:$_let_$ :f (:$$_lambda_$$ [x] {:x}))})")
+  testParseToBe("f(x)=2*x", "Ok({(:$_let_$ :f (:$$_lambda_$$ [x] {(:multiply 2 :x)}))})")
   //MathJs does not allow blocks in function definitions
 })
 
diff --git a/packages/squiggle-lang/__tests__/Reducer/Reducer_functionTricks_test.res b/packages/squiggle-lang/__tests__/Reducer/Reducer_functionTricks_test.res
index fd7485eb..ca6f0399 100644
--- a/packages/squiggle-lang/__tests__/Reducer/Reducer_functionTricks_test.res
+++ b/packages/squiggle-lang/__tests__/Reducer/Reducer_functionTricks_test.res
@@ -51,7 +51,7 @@ describe("call and bindings", () => {
   )
   testParseToBe(
     "f=99; g(x)=f; g(2)",
-    "Ok((:$$_block_$$ (:$_let_$ :f (:$$_block_$$ 99)) (:$_let_$ :g (:$$_lambda_$$ [x] (:$$_block_$$ :f))) (:g 2)))",
+    "Ok({(:$_let_$ :f {99}); (:$_let_$ :g (:$$_lambda_$$ [x] {:f})); (:g 2)})",
   )
   testEvalToBe("f=99; g(x)=f; g(2)", "Ok(99)")
   testEvalToBe("f(x)=x; g(x)=f(x); g(2)", "Ok(2)")
diff --git a/packages/squiggle-lang/__tests__/Reducer/Reducer_ternaryOperator_test.res b/packages/squiggle-lang/__tests__/Reducer/Reducer_ternaryOperator_test.res
index 57b44156..25353e89 100644
--- a/packages/squiggle-lang/__tests__/Reducer/Reducer_ternaryOperator_test.res
+++ b/packages/squiggle-lang/__tests__/Reducer/Reducer_ternaryOperator_test.res
@@ -2,7 +2,7 @@ open Jest
 open Reducer_TestHelpers
 
 describe("Parse ternary operator", () => {
-  testParseToBe("true ? 'YES' : 'NO'", "Ok((:$$_block_$$ (:$$_ternary_$$ true 'YES' 'NO')))")
+  testParseToBe("true ? 'YES' : 'NO'", "Ok({(:$$_ternary_$$ true 'YES' 'NO')})")
 })
 
 describe("Evaluate ternary operator", () => {
diff --git a/packages/squiggle-lang/__tests__/ReducerInterface/ReducerInterface_Distribution_test.res b/packages/squiggle-lang/__tests__/ReducerInterface/ReducerInterface_Distribution_test.res
index 4e2f9aaa..a2fa37df 100644
--- a/packages/squiggle-lang/__tests__/ReducerInterface/ReducerInterface_Distribution_test.res
+++ b/packages/squiggle-lang/__tests__/ReducerInterface/ReducerInterface_Distribution_test.res
@@ -123,13 +123,13 @@ describe("eval on distribution functions", () => {
 
 describe("parse on distribution functions", () => {
   describe("power", () => {
-    testParse("normal(5,2) ^ normal(5,1)", "Ok((:$$_block_$$ (:pow (:normal 5 2) (:normal 5 1))))")
-    testParse("3 ^ normal(5,1)", "Ok((:$$_block_$$ (:pow 3 (:normal 5 1))))")
-    testParse("normal(5,2) ^ 3", "Ok((:$$_block_$$ (:pow (:normal 5 2) 3)))")
+    testParse("normal(5,2) ^ normal(5,1)", "Ok({(:pow (:normal 5 2) (:normal 5 1))})")
+    testParse("3 ^ normal(5,1)", "Ok({(:pow 3 (:normal 5 1))})")
+    testParse("normal(5,2) ^ 3", "Ok({(:pow (:normal 5 2) 3)})")
   })
   describe("subtraction", () => {
-    testParse("10 - normal(5,1)", "Ok((:$$_block_$$ (:subtract 10 (:normal 5 1))))")
-    testParse("normal(5,1) - 10", "Ok((:$$_block_$$ (:subtract (:normal 5 1) 10)))")
+    testParse("10 - normal(5,1)", "Ok({(:subtract 10 (:normal 5 1))})")
+    testParse("normal(5,1) - 10", "Ok({(:subtract (:normal 5 1) 10)})")
   })
   describe("pointwise arithmetic expressions", () => {
     testParse(~skip=true, "normal(5,2) .+ normal(5,1)", "Ok((:dotAdd (:normal 5 2) (:normal 5 1)))")
@@ -137,23 +137,14 @@ describe("parse on distribution functions", () => {
       ~skip=true,
       "normal(5,2) .- normal(5,1)",
       "Ok((:$$_block_$$ (:dotSubtract (:normal 5 2) (:normal 5 1))))",
-      // TODO: !!! returns "Ok((:$$_block_$$ (:dotPow (:normal 5 2) (:normal 5 1))))"
-    )
-    testParse(
-      "normal(5,2) .* normal(5,1)",
-      "Ok((:$$_block_$$ (:dotMultiply (:normal 5 2) (:normal 5 1))))",
-    )
-    testParse(
-      "normal(5,2) ./ normal(5,1)",
-      "Ok((:$$_block_$$ (:dotDivide (:normal 5 2) (:normal 5 1))))",
-    )
-    testParse(
-      "normal(5,2) .^ normal(5,1)",
-      "Ok((:$$_block_$$ (:dotPow (:normal 5 2) (:normal 5 1))))",
+      // TODO: !!! returns "Ok({(:dotPow (:normal 5 2) (:normal 5 1))})"
     )
+    testParse("normal(5,2) .* normal(5,1)", "Ok({(:dotMultiply (:normal 5 2) (:normal 5 1))})")
+    testParse("normal(5,2) ./ normal(5,1)", "Ok({(:dotDivide (:normal 5 2) (:normal 5 1))})")
+    testParse("normal(5,2) .^ normal(5,1)", "Ok({(:dotPow (:normal 5 2) (:normal 5 1))})")
   })
   describe("equality", () => {
-    testParse("5 == normal(5,2)", "Ok((:$$_block_$$ (:equal 5 (:normal 5 2))))")
+    testParse("5 == normal(5,2)", "Ok({(:equal 5 (:normal 5 2))})")
   })
   describe("pointwise adding two normals", () => {
     testParse(~skip=true, "normal(5,2) .+ normal(5,1)", "Ok((:dotAdd (:normal 5 2) (:normal 5 1)))")
diff --git a/packages/squiggle-lang/src/rescript/Reducer/Reducer_Expression/Reducer_Expression_T.res b/packages/squiggle-lang/src/rescript/Reducer/Reducer_Expression/Reducer_Expression_T.res
index 65ba4c96..512e08ea 100644
--- a/packages/squiggle-lang/src/rescript/Reducer/Reducer_Expression/Reducer_Expression_T.res
+++ b/packages/squiggle-lang/src/rescript/Reducer/Reducer_Expression/Reducer_Expression_T.res
@@ -28,6 +28,11 @@ type reducerFn = (
 */
 let rec toString = expression =>
   switch expression {
+  | EList(list{EValue(EvCall("$$_block_$$")), ...statements}) =>
+    `{${Belt.List.map(statements, aValue => toString(aValue))
+      ->Extra.List.interperse("; ")
+      ->Belt.List.toArray
+      ->Js.String.concatMany("")}}`
   | EList(aList) =>
     `(${Belt.List.map(aList, aValue => toString(aValue))
       ->Extra.List.interperse(" ")