fixes examples and std after lambda change (#41)

playground/examples/closure.nemo

@@ -9,7 +9,5 @@ fn main() -> i32 {
 }
 
 fn twice[a](f : fn(a) -> a) -> fn (a) -> a {
-    fn (x : a) -> a {
-        f(f(x))
-    }
+    \(x) { f(f(x)) }
 }

playground/examples/histogram.nemo

@@ -5,14 +5,14 @@ fn tick(time_elapsed_ms: f32) -> unit {
   if frame_timer > 100.0 {
     set frame_timer = 0.0;
     clear();
-    let generator = fn() -> i32 { random_int(0, 99) };
+    let generator = \() -> i32 { random_int(0, 99) };
     let buckets = histogram(10, generator);
     render_canvas(buckets)
   } else {}
 }
 
 fn main() {
-  let generator = fn() -> i32 { random_int(0, 99) };
+  let generator = \() -> i32 { random_int(0, 99) };
   let buckets = histogram(10, generator);
   render(buckets)
 }

playground/examples/lambda.nemo

@@ -1,7 +1,7 @@
 fn main() -> i32 {
   let x = 1;
-  let f = fn (y : i32) -> i32 {
+  let f = \(y : i32) -> i32 {
     y + x
   };
   f(2)
-}
+}

playground/examples/list.nemo

@@ -3,7 +3,7 @@
 // Both via recursion and imperative style.
 fn main() {
   let list = range(0, 10);
-  let squared = map#[i32, i32](fn (x : i32) -> i32 { x * x }, list);
+  let squared = map#[i32, i32](\(x) { x * x }, list);
   for_each#[i32](log, squared);
   log(sum(squared))
 }

playground/examples/strings.nemo

@@ -74,7 +74,7 @@ struct MutBox[a] {
 // An iterator over the codepoints in a utf8 string
 fn chars(bs : bytes) -> fn () -> Option[i32] {
   let offset = MutBox { value = 0 };
-  fn () -> Option[i32] {
+  \() {
     if offset.value == bytes_len(bs) {
       Option::None {}
     } else {
@@ -168,7 +168,7 @@ fn str_new(buf : bytes) -> Str {
 
 fn str_chars(s : Str) -> fn () -> Option[i32] {
   let offset = MutBox { value = s.offset };
-  fn () -> Option[i32] {
+  \() {
     if offset.value >= s.offset + s.len {
       Option::None {}
     } else {

std/string.nemo

@@ -39,7 +39,7 @@ fn unsafe_new(buf : bytes) -> Str {
 
 fn chars(s : Str) -> fn () -> option::Option[i32] {
   let offset = MutBox { value = s.offset };
-  fn () -> option::Option[i32] {
+  \() {
     if offset.value >= s.offset + s.len {
       option::Option::None {}
     } else {