Use ArrayString for small string optimization in editor AST

Cargo.lock

@@ -91,6 +91,15 @@ dependencies = [
  "pretty_assertions",
 ]
 
+[[package]]
+name = "arraystring"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d517c467117e1d8ca795bc8cc90857ff7f79790cca0e26f6e9462694ece0185"
+dependencies = [
+ "typenum",
+]
+
 [[package]]
 name = "arrayvec"
 version = "0.5.1"
@@ -2358,6 +2367,7 @@ dependencies = [
 name = "roc_editor"
 version = "0.1.0"
 dependencies = [
+ "arraystring",
  "bumpalo",
  "env_logger 0.7.1",
  "futures",
@@ -2389,7 +2399,6 @@ dependencies = [
  "roc_unify",
  "roc_uniq",
  "target-lexicon",
- "tokio",
  "wgpu",
  "wgpu_glyph",
  "winit",

editor/Cargo.toml

@@ -28,7 +28,7 @@ im    = "14" # im and im-rc should always have the same version!
 im-rc = "14" # im and im-rc should always have the same version!
 bumpalo = { version = "3.2", features = ["collections"] }
 inlinable_string = "0.1"
-tokio = { version = "0.2", features = ["blocking", "fs", "sync", "rt-threaded", "process", "io-driver"] }
+arraystring = "0.3.0"
 # NOTE: rtfeldman/inkwell is a fork of TheDan64/inkwell which does not change anything.
 #
 # The reason for this fork is that the way Inkwell is designed, you have to use

editor/src/ast.rs

@@ -1,3 +1,4 @@
+use arraystring::{typenum::U14, ArrayString};
 use inlinable_string::string_ext::StringExt;
 use inlinable_string::InlinableString;
 use roc_types::subs::Variable;
@@ -267,8 +268,10 @@ pub enum Expr2 {
         text_bytes: *const u8,
         var: Variable,
     },
-    Str {
-        bytes: [u8; 15],
+    SmallStr(ArrayString<U14>),
+    BigStr {
+        bytes: *const u8,
+        len: u32,
     },
 }