diff --git a/Makefile b/Makefile
index cb0d8c5..a781c13 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,9 @@ all: newt.js
 
 REV=$(shell git rev-parse --short HEAD)
 src/Revision.newt: .PHONY
-	echo "module Revision\nimport Prelude\ngitRevision : String\ngitRevision = \"${REV}\"" > src/Revision.newt
+	echo "module Revision\nimport Prelude\ngitRevision : String\ngitRevision = \"${REV}\"" > src/Revision.newt.new
+	cmp src/Revision.newt.new src/Revision.newt || cp src/Revision.newt.new src/Revision.newt
+	rm -f src/Revision.newt.new
 
 newt.js: ${SRCS} src/Revision.newt
 	-rm build/* >/dev/null
diff --git a/TODO.md b/TODO.md
index 01d185d..60d2a17 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,9 +1,11 @@
 
 ## TODO
 
+- [ ] change "in prefix position" and "trailing operator" errors to do sections
 - [ ] maybe add fat arrows, I keep wanting to type them, `{{...}}` is a little ugly
-  - There may be ambiguity issues
+  - There may be ambiguity issues at the parsing level, but we don't have typecase, so...
 - [x] get some names on add missing cases (if not too difficult)
+- [ ] Implement "add missing cases" for playground
 - [x] add optional types to case `case xxx : Maybe Int of ...`
 - [x] "Expected keyword" at `\ a ->` should be error at the `->`
 - [x] Show Either
diff --git a/src/Lib/Elab.newt b/src/Lib/Elab.newt
index a6e5d47..cb4eb9c 100644
--- a/src/Lib/Elab.newt
+++ b/src/Lib/Elab.newt
@@ -669,8 +669,6 @@ primType fc nm = do
       Just (MkEntry _ name ty (PrimTCon _) _) => pure $ VRef fc name Lin
       _ => error fc "Primitive type \{show nm} not in scope"
 
-infer : Context -> Raw  -> M (Tm × Val)
-
 data Bind = MkBind String Icit Val
 
 instance Show Bind where
@@ -1431,6 +1429,7 @@ updateRec ctx fc clauses arg ty = do
     getTele Nothing v = error (getFC v) "Expected a pi type, got \{show v}"
     getTele _ v = error (getFC v) "Expected a record type, got \{show v}"
 
+infer : Context -> Raw  -> M (Tm × Val)
 
 check ctx tm ty = do
   ty' <- forceType ctx.env ty
diff --git a/src/Prelude.newt b/src/Prelude.newt
index 12af0f3..662db97 100644
--- a/src/Prelude.newt
+++ b/src/Prelude.newt
@@ -716,6 +716,13 @@ instance Functor IO where
 uncurry : ∀ a b c. (a → b → c) → (a × b) → c
 uncurry f (a,b) = f a b
 
+curry : ∀ a b c. (a × b → c) → (a → b → c)
+curry f a b = f (a,b)
+
+-- TODO Belongs in prelude, but I need to rename a function in Lib.Compile (or let local win over imports)
+-- apply : ∀ a b. (a → b) → a → b
+-- apply f a = f a
+
 -- TODO Idris has a tail recursive version of this
 instance Applicative List where
   return a = a :: Nil