Merging in remote, implemented basics of List append in many modules

compiler/module/src/low_level.rs

@@ -0,0 +1,36 @@
+/// Low-level operations that get translated directly into e.g. LLVM instructions.
+/// These are always wrapped when exposed to end users, and can only make it
+/// into an Expr when added directly by can::builtins
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum LowLevel {
+    ListLen,
+    ListGetUnsafe,
+    ListSet,
+    ListSetInPlace,
+    ListSingle,
+    ListRepeat,
+    ListReverse,
+    ListAppend,
+    ListPush,
+    NumAdd,
+    NumSub,
+    NumMul,
+    NumGt,
+    NumGte,
+    NumLt,
+    NumLte,
+    NumDivUnchecked,
+    NumRemUnchecked,
+    NumAbs,
+    NumNeg,
+    NumSin,
+    NumCos,
+    NumSqrtUnchecked,
+    NumRound,
+    NumToFloat,
+    Eq,
+    NotEq,
+    And,
+    Or,
+    Not,
+}