fix tests

@@ -124,8 +124,8 @@ map((
 x +. (Environment.width /. 2. -. centering.x)
 })
 
-let _ = assert { true }
-let _ = { assert { true } }
+let _ = assert({ true })
+let _ = { assert({ true }) }
 let _ = { lazy { true } }
 
 let _ = { %extension }

@@ -43,7 +43,7 @@ let () = {
 
 let x = (\"type" : \"module")
 
-assert \"let"
+assert(\"let")
 
 lazy \"let"
 

@@ -1,24 +1,323 @@
+let f = (a, b) => {a + b}
+let f = (a, b) => {a}
 
-Syntax error!
-tests/printer/expr/braced.res:127:15-16
+let f = (a, b) => {
+a + b
+}
 
-125 │ })
-126 │
-127 │ let _ = assert { true }
-128 │ let _ = { assert { true } }
-129 │ let _ = { lazy { true } }
+let f = (a, b) => {
+a
+}
 
-Did you forget a `(` here?
+let x = {a}
+let x = {a + b}
 
+let x = {
+// here
+a
+}
 
-Syntax error!
-tests/printer/expr/braced.res:128:17-18
+let x = {
+// here
+a + b
+}
 
-126 │
-127 │ let _ = assert { true }
-128 │ let _ = { assert { true } }
-129 │ let _ = { lazy { true } }
-130 │
+let _ = {a}
 
-Did you forget a `(` here?
+let _ = {"constant"}
 
+let _ = {() => Js.log("test")}
+let _ = {
+switch b {
+| true => ()
+| false => ()
+}
+}
+let _ = switch {b} {
+| true => ()
+| false => ()
+}
+let _ = {apply(a, b)}
+let _ = {apply}(a, b)
+
+let _ = {
+try danger() catch {
+| Exit => ()
+}
+}
+let _ = try {danger()} catch {
+| Exit => ()
+}
+
+let _ = ({a}, {b}, {x + y})
+let _ = {({a}, {b}, {x + y})}
+
+let _ = {Rgb(r, g, b)}
+let _ = Rgb({r}, {g}, {b})
+let _ = Rgb(
+{
+r
+},
+{
+g
+},
+{
+b
+},
+)
+
+let _ = {{name: "steve", age: 30}}
+let _ = {name: {"steve"}, age: {30}}
+let _ = {
+name: {
+"steve"
+},
+age: {
+30
+},
+}
+
+let _ = {user.name}.toString()
+let _ = {{user.name}.toString()}
+let _ = {user.name}.first
+let _ = {{user.name}.first}
+
+let _ = {[a, b, c]}
+let _ = [{a}, {b}, {c}]
+let _ = [
+{
+a
+},
+{
+b
+},
+{
+c
+},
+]
+
+let _ = {list{a, b, c}}
+let _ = {list{{a}, {b}, {c}}}
+let _ = {
+list{
+{
+a
+},
+{
+b
+},
+{
+c
+},
+}
+}
+
+let _ = list{1, 2, ...{list2}}
+
+let _ = {true} ? {true} : {false}
+let _ = {{true} ? {true} : {false}}
+
+let _ = {
+if true {
+()
+} else {
+()
+}
+}
+let _ = {
+if {true} {
+()
+} else {
+()
+}
+}
+
+if {
+true
+} {
+()
+} else if {
+false
+} {
+()
+}
+
+if {
+true
+} {
+()
+} else if {
+false
+} {
+()
+} else {
+()
+}
+
+let _ = {
+while true {
+()
+}
+}
+let _ = while {true} {
+()
+}
+while {/* c0 */ true /* c1 */} {
+()
+}
+while (
+{
+true
+}
+) {
+()
+}
+while (
+{
+/* c0 */ true // c1
+}
+) {
+()
+}
+
+let _ = {
+for _ in {0} to {10} {
+()
+}
+}
+for _ in {
+0
+} to {
+10
+} {
+()
+}
+
+let _ = {(foo: string)}
+let f = (): string => {foo} // equivalent to (): string => ...
+
+let localToGlobalX = (
+x: coordinate<localCoordinates>,
+~centering: coordinate<localCoordinates>,
+): coordinate<globalCoordinates> => {
+x +. (Environment.width /. 2. -. centering.x)
+}
+map((arr, i): coordinate<globalCoordinates> => {
+x +. (Environment.width /. 2. -. centering.x)
+})
+
+let _ = assert(true)
+let _ = {assert(true)}
+let _ = {lazy {true}}
+
+let _ = {%extension}
+let _ = {module(ME)}
+let _ = {module(ME: MyMod)}
+
+{myArray}[{0}]
+{
+myArray
+}[{
+0
+}]
+{myArray}[{0}] = {20}
+{
+myArray
+}[{
+0
+}] = {
+20
+}
+
+myArray[20] = {
+a + b
+}
+
+{jsObject}["foo"]
+{jsObject}["foo"] = {"bar"}
+{jsObject}["foo"] = {
+a + b
+}
+
+{
+jsObject
+}["foo"]
+{jsObject}["foo"] = {"bar"}
+
+apply({a}, {b}, {c})
+apply(
+{
+a
+},
+{
+b
+},
+{
+c
+},
+)
+
+Thing.map(foo, (arg1, arg2) => {MyModuleBlah.toList(argument)})
+Thing.map({foo}, (arg1, arg2) => {
+MyModuleBlah.toList(argument)
+})
+
+Thing.map(
+{fooSuperLongIdentifierName},
+{fooSuperLongIdentifierName},
+{fooSuperLongIdentifierName},
+(arg1, arg2) => {
+MyModuleBlah.toList(argument)
+},
+)
+
+arr->Belt.Array.map(x => {
+a
+})
+
+apply(~a={a})
+apply({
+a
+})
+apply(. {
+a
+})
+
+let x = {<div> child </div>}
+
+// not valid jsx
+let x = {@JSX child}
+
+let x = {
+// comment1
+a + b
+}
+
+let x = {
+// commment2
+!truth
+}
+
+{
+/* c0 */
+x
+/* c1 */
+}
+
+{
+// comment
+a +
+b
+}
+
+{a} + {b}
+{
+a
+} +
+{
+b
+}
+
+// string constant should be printed correct
+(<> {"\n"->React.string} </>)
+(<> {"\""->React.string} </>)