conlang: add lang items, remove Empty, and shuffle typeck

sample-code/fstring.cl

@@ -1,5 +1,8 @@
+//! Implements format string evaluation in weak Conlang
 
-fn f(__fmt: str) -> str {
+
+/// Formats a string
+fn f(__fmt: &str) -> &str {
     let __out = "";
     let __expr = "";
     let __label = "";

sample-code/math.cl

@@ -4,13 +4,11 @@
 // These two functions shouldn't actually be polymorphic, but
 // the AST interpreter doesn't know about type annotations
 // or operator overloading.
-#[generic("T")]
-pub fn max(a: T, b: T) -> T {
+pub fn max<T>(a: T, b: T) -> T {
     (if a < b { b } else { a })
 }
 
-#[generic("T")]
-pub fn min(a: T, b: T) -> T {
+pub fn min<T>(a: T, b: T) -> T {
     (if a > b { b } else { a })
 }
 

sample-code/rand.cl

@@ -13,11 +13,11 @@ pub fn lfsr_next() {
 }
 
 /// Returns a pseudorandom byte
-pub fn rand() -> u8 {
+pub fn rand() -> u64 {
     for _ in 0..8 {
         lfsr_next()
-    }
-    state & 0xff
+    };
+    (state & 0xff) as u64
 }
 
 // Prints a maze out of diagonal box drawing characters, ['╲', '╱']