diff --git a/TODO.md b/TODO.md
index 5e90adb..7f2c4e7 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,6 +1,7 @@
 
 ## TODO
 
+- [x] Take the parens off of FC to make vscode happy
 - [ ] in-scope type at point in vscode
   - So the idea here is that the references will be via FC, we remember the type at declaration and then point the usage back to the declaration (FC -> FC). We could dump all of this. (If we're still doing json.)
   - Do we want to (maybe later) keep the scope as a FC? We could do scope at point then.
diff --git a/newt-vscode/src/extension.ts b/newt-vscode/src/extension.ts
index b87aae8..fc66a4b 100644
--- a/newt-vscode/src/extension.ts
+++ b/newt-vscode/src/extension.ts
@@ -109,7 +109,7 @@ export function activate(context: vscode.ExtensionContext) {
             console.log("top data", topData);
           }
             const match = line.match(
-            /(INFO|WARN|ERROR) at (.*):\((\d+):(\d+)-(\d+):(\d+)\):\s*(.*)/
+            /(INFO|WARN|ERROR) at (.*):(\d+):(\d+)--(\d+):(\d+):\s*(.*)/
             );
           if (match) {
             let [_full, kind, file, line, column, eline, ecol, message] = match;
@@ -288,12 +288,12 @@ export function activate(context: vscode.ExtensionContext) {
         provideCodeActions(document, range, context, token) {
           const actions: vscode.CodeAction[] = [];
           for (const diagnostic of context.diagnostics) {
-            let {message,range} = diagnostic
-            let m = diagnostic.message.match(/missing cases: (.*)/);
+            let {message,range} = diagnostic;
+            let m = message.match(/missing cases: (.*)/);
             if (m) {
               // A lot of this logic would also apply to case split.
               let cons = m[1].split(', ');
-              const line = diagnostic.range.start.line;
+              const line = range.start.line;
               const lineText = document.lineAt(line).text;
               let m2 = lineText.match(/(.*=>?)/);
               if (!m2) continue;
diff --git a/playground/src/main.ts b/playground/src/main.ts
index 2252228..4356051 100644
--- a/playground/src/main.ts
+++ b/playground/src/main.ts
@@ -440,7 +440,7 @@ const processOutput = (
   for (let i = 0; i < lines.length; i++) {
     const line = lines[i];
     const match = line.match(
-      /(INFO|ERROR) at ([^:]+):\((\d+):(\d+)-(\d+):(\d+)\):\s*(.*)/
+      /(INFO|ERROR) at ([^:]+):(\d+):(\d+)--(\d+):(\d+):\s*(.*)/
     );
     if (match) {
       let [_full, kind, file, line, col, eline, ecol, message] = match;
diff --git a/src/Lib/Common.newt b/src/Lib/Common.newt
index bca886a..9b39ec5 100644
--- a/src/Lib/Common.newt
+++ b/src/Lib/Common.newt
@@ -158,8 +158,7 @@ data Error
 
 instance Show FC where
   -- We add one to the end column so it points after the end, which seems to be what Idris does
-  show (MkFC file (MkBounds l c el ec)) = "\{file}:(\{show $ l + 1}:\{show $ c + 1}-\{show $ el + 1}:\{show $ ec + 2})"
-
+  show (MkFC file (MkBounds l c el ec)) = "\{file}:\{show $ l + 1}:\{show $ c + 1}--\{show $ el + 1}:\{show $ ec + 2}"
 
 showError : String -> Error -> String
 showError src (E fc msg) = "ERROR at \{show fc}: \{msg}\n" ++ go 0 (lines src)
diff --git a/tests/BadAlt.newt.fail b/tests/BadAlt.newt.fail
index 747ccdd..6bcbdc9 100644
--- a/tests/BadAlt.newt.fail
+++ b/tests/BadAlt.newt.fail
@@ -1,10 +1,10 @@
 *** Process tests/BadAlt.newt
 module Prelude
 module BadAlt
-ERROR at tests/BadAlt.newt:(6, 9): Prelude._:<_ not a constructor for (Prelude.List Prim.Int)
+ERROR at tests/BadAlt.newt:6:6--6:13: Prelude._:<_ not a constructor for (Prelude.List Prim.Int)
   
   foo : List Int → Int
   foo (xs :< x) = x
-          ^
+       ^^^^^^^
 
 Compile failed
diff --git a/tests/LitConCase.newt.fail b/tests/LitConCase.newt.fail
index fb1dc6c..000172f 100644
--- a/tests/LitConCase.newt.fail
+++ b/tests/LitConCase.newt.fail
@@ -1,9 +1,9 @@
 *** Process tests/LitConCase.newt
 module LitConCase
-ERROR at tests/LitConCase.newt:(7, 5): expected Prim.Int
+ERROR at tests/LitConCase.newt:7:5--7:11: expected Prim.Int
   foo : Int → Unit
   foo 0 = MkUnit
   foo MkUnit = MkUnit
-      ^
+      ^^^^^^
 
 Compile failed