diff --git a/newt-vscode/language-configuration.json b/newt-vscode/language-configuration.json
index 5fa3abb..87764cc 100644
--- a/newt-vscode/language-configuration.json
+++ b/newt-vscode/language-configuration.json
@@ -33,7 +33,7 @@
   ],
   "onEnterRules": [
     {
-      "beforeText": "\\b(where|of|case)$",
+      "beforeText": "\\b(where|of|do)\\s*$",
       "action": { "indent": "indent" }
     },
     {
diff --git a/newt-vscode/src/abbrev.ts b/newt-vscode/src/abbrev.ts
index a2e22ae..2edf5b6 100644
--- a/newt-vscode/src/abbrev.ts
+++ b/newt-vscode/src/abbrev.ts
@@ -7,4 +7,9 @@ export const ABBREV: Record<string, string> = {
   "\\circ": "∘",
   "\\1": "₁",
   "\\2": "₂",
+  "\\<": "⟨",
+  "\\>": "⟩",
+  "\\_0": "₀",
+  "\\_1": "₁",
+  "\\bN": "ℕ"
 };
diff --git a/playground/src/cmeditor.ts b/playground/src/cmeditor.ts
index 72789fd..1b76e1d 100644
--- a/playground/src/cmeditor.ts
+++ b/playground/src/cmeditor.ts
@@ -1,10 +1,12 @@
 import { AbstractEditor, EditorDelegate, Marker } from "./types";
 import { basicSetup } from "codemirror";
-import { EditorView, hoverTooltip, Tooltip } from "@codemirror/view";
-import { Compartment } from "@codemirror/state";
+import { defaultKeymap, indentMore, indentLess, toggleLineComment } from "@codemirror/commands";
+import { EditorView, hoverTooltip, keymap, Tooltip } from "@codemirror/view";
+import { Compartment, Prec } from "@codemirror/state";
 import { oneDark } from "@codemirror/theme-one-dark";
 import { linter } from "@codemirror/lint";
 import {
+  indentService,
   LanguageSupport,
   StreamLanguage,
   StringStream,
@@ -61,7 +63,7 @@ interface State {
 }
 
 function tokenizer(stream: StringStream, state: State): string | null {
-  stream.eatSpace();
+  if (stream.eatSpace()) return null
   if (stream.match("--")) {
     stream.skipToEnd();
     return "comment";
@@ -70,17 +72,19 @@ function tokenizer(stream: StringStream, state: State): string | null {
     state.tokenizer = commentTokenizer;
     return state.tokenizer(stream, state);
   }
-  if (stream.match(/^[\w_][\w\d_']*/)) {
+
+  // TODO match tokenizer better..
+  if (stream.match(/[^\\(){}[\],.@;\s][^()\\{}\[\],.@;\s]*/)) {
     let word = stream.current();
     if (keywords.includes(word)) return "keyword";
     if (word[0] >= "A" && word[0] <= "Z") return "typename";
+    console.log('IDENT', )
     return "identifier";
   }
   // unhandled
-  stream.next();
+  stream.next()
   return null;
 }
-
 function commentTokenizer(stream: StringStream, state: State): string | null {
   console.log("ctok");
   let dash = false;
@@ -100,6 +104,12 @@ const newtLanguage2 = StreamLanguage.define({
   token(stream, st) {
     return st.tokenizer(stream, st);
   },
+  languageData: {
+    commentTokens: {
+      line: "--"
+    },
+    wordChars: "!#$%^&*_+-=<>|",
+  }
 });
 
 function newt() {
@@ -120,12 +130,46 @@ export class CMEditor implements AbstractEditor {
       extensions: [
         basicSetup,
         linter((view) => this.delegate.lint(view)),
-        this.theme.of(EditorView.baseTheme({})),
+        // For indent on return
+        indentService.of((ctx, pos) => {
+          let line = ctx.lineAt(pos)
+          if (!line) return null
+            let prevLine = ctx.lineAt(line.from - 1);
+            if (prevLine.text.trimEnd().match(/\b(of|where|do)\s*$/)) {
+              let pindent = prevLine.text.match(/^\s*/)?.[0].length ?? 0
+              return pindent + 2
+            }
+          return null
+        }),
+        Prec.highest(keymap.of([
+          {
+            key: "Tab",
+            preventDefault: true,
+            run: indentMore,
+          },
+          {
+            key: "Cmd-/",
+            run: toggleLineComment,
+          },
+          // ok, we can do multiple keys (we'll want this for Idris)
+          {
+            key: "c-c c-s",
+            run: () => {
+              console.log("C-c C-s")
+              return false
+            }
+          },
+          {
+            key: "Shift-Tab",
+            preventDefault: true,
+            run: indentLess,
+          },
+        ])),
         EditorView.updateListener.of((update) => {
           let doc = update.state.doc;
 
           update.changes.iterChanges((fromA, toA, fromB, toB, inserted) => {
-            if (" ')\\".includes(inserted.toString())) {
+            if (" ')\\_".includes(inserted.toString())) {
               console.log("changes", update.changes, update.changes.desc);
               let line = doc.lineAt(fromA);
               let e = fromA - line.from;
@@ -146,6 +190,7 @@ export class CMEditor implements AbstractEditor {
             }
           });
         }),
+        this.theme.of(EditorView.baseTheme({})),
         hoverTooltip((view, pos) => {
           let cursor = this.view.state.doc.lineAt(pos);
           let line = cursor.number;
@@ -155,7 +200,8 @@ export class CMEditor implements AbstractEditor {
             let col = range.from - cursor.from;
             let word = this.view.state.doc.sliceString(range.from, range.to);
             let entry = this.delegate.getEntry(word, line, col);
-            console.log("entry", entry);
+            if (!entry) entry = this.delegate.getEntry('_'+word+'_', line, col);
+            console.log("entry for", word, "is", entry);
             if (entry) {
               let rval: Tooltip = {
                 pos: range.head,
diff --git a/playground/src/main.ts b/playground/src/main.ts
index 57a88dd..54115ce 100644
--- a/playground/src/main.ts
+++ b/playground/src/main.ts
@@ -185,6 +185,7 @@ const language: EditorDelegate = {
     return topData?.context.find((entry) => entry.name === word);
   },
   onChange(value) {
+    // run via the linter now
     // clearTimeout(timeout);
     //   timeout = setTimeout(() => {
     //     run(value);
@@ -199,15 +200,17 @@ const language: EditorDelegate = {
   async lint(view) {
     console.log("LINT");
     let src = view.state.doc.toString();
+    localStorage.code = src
+    // we'll want to pull it from the file.
     const fileName = state.currentFile.value;
     console.log("FN", fileName);
-    // console.log("SRC", src);
     try {
       let out = await runCommand({
         id: nextID(),
         type: "compileRequest",
         fileName,
         src,
+        compile: false,
       });
       console.log("OUT", out);
       let markers = processOutput(out);
diff --git a/playground/src/types.ts b/playground/src/types.ts
index 6cdd5f7..ea45e66 100644
--- a/playground/src/types.ts
+++ b/playground/src/types.ts
@@ -6,6 +6,7 @@ export interface CompileReq {
   type: "compileRequest";
   fileName: string;
   src: string;
+  compile: boolean;
 }
 
 export interface CompileRes {
diff --git a/playground/src/worker.ts b/playground/src/worker.ts
index 1875ff2..575460a 100644
--- a/playground/src/worker.ts
+++ b/playground/src/worker.ts
@@ -3,8 +3,8 @@ import { archive, preload } from "./preload";
 import { CompileReq, CompileRes } from "./types";
 
 console.log = (m) => {
-  shim.stdout += '\n' + m
-}
+  shim.stdout += "\n" + m;
+};
 
 const handleMessage = async function (ev: { data: CompileReq }) {
   console.log("message", ev.data);
@@ -12,7 +12,10 @@ const handleMessage = async function (ev: { data: CompileReq }) {
   shim.archive = archive;
   let { id, src, fileName } = ev.data;
   const outfile = "out.js";
-  shim.process.argv = ["browser", "newt", fileName, "-o", outfile, "--top"];
+  if (ev.data.compile)
+    shim.process.argv = ["browser", "newt", fileName, "-o", outfile, "--top"];
+  else
+    shim.process.argv = ["browser", "newt", fileName, "--top"];
   shim.files[fileName] = new TextEncoder().encode(src);
   shim.files[outfile] = new TextEncoder().encode("No JS output");
   shim.stdout = "";
@@ -29,7 +32,7 @@ const handleMessage = async function (ev: { data: CompileReq }) {
   console.log(`process ${fileName} in ${duration} ms`);
   let javascript = new TextDecoder().decode(shim.files[outfile]);
   let output = shim.stdout;
-  sendResponse({ id, type: 'compileResult', javascript, output, duration });
+  sendResponse({ id, type: "compileResult", javascript, output, duration });
 };
 
 // hooks for worker.html to override
diff --git a/src/Lib/Compile.newt b/src/Lib/Compile.newt
index 0a03f42..c8ed6c1 100644
--- a/src/Lib/Compile.newt
+++ b/src/Lib/Compile.newt
@@ -286,10 +286,6 @@ stmtToDoc (JError str) = text "throw new Error(" ++ text (quoteString str) ++ te
 stmtToDoc (JCase sc alts) =
   text "switch (" ++ expToDoc sc ++ text ")" <+> bracket "{" (stack $ map altToDoc alts) "}"
 
-mkArgs : Nat -> List String -> List String
-mkArgs Z acc = acc
-mkArgs (S k) acc = mkArgs k ("h\{show k}" :: acc)
-
 -- use iife to turn stmts into expr
 maybeWrap : JSStmt Return -> JSExp
 maybeWrap (JReturn exp) = exp
@@ -399,6 +395,7 @@ process name = do
   eraseEntries
   liftWhere
   entries <- readIORef ref
+  -- Now working with defs
   exprs <- mapM defToCExp $ toList entries
   let cexpMap = foldMap const EmptyMap exprs
   cexpMap <- tailCallOpt cexpMap