Update spec

spec.txt

@@ -11,8 +11,7 @@ Built-in types:
    i16
    i32
    i64
-   f8  (maybe? cpu-emulated at best)
-   f16 (maybe? cpu-emulated at best)
+   f16
    f32
    f64
 
@@ -32,6 +31,7 @@ Array types:
 Function types:
    (arg1, arg2, arg3) -> result
    (arg1, arg2) -> unit            // no return value
+   arg -> result                   // simplified syntax for single-argument case
 
 ======== LITERALS ========
 
@@ -45,16 +45,15 @@ Literals:
     123l   -> i64
     123ul  -> u64
     3.14h  -> f16
-    3.14f  -> f32
-    3.14   -> f64
-    'a'    -> u8
+    3.14   -> f32
+    3.14l  -> f64
+    'a'    -> u8 (ascii only?)
     '猫'u  -> u32
 
-TODO: string literals? fixed-size arrays? built-in spans?
+TODO: string literals? fixed-size arrays? built-in spans? Probably built-in spans (potentially defines in prelude.psl)
     "hello, world" -> utf-8 string
     "здарова, братки"u -> utf-32 string
 
-
 ======== VARIABLES ========
 
 Variable declaration:
@@ -67,10 +66,13 @@ Variable declaration:
 
 Array declaration: 
     let arr: i32[4] = [12, 15, 65, 42]
-    let arr: i32[] = [56, 23] // size inferred as 2 - maybe forbid this?
     let arr = [2, 5, 6] // size and type inferred as i32[3]
+    let arr: i32[0] = [] // need special empty array literal, type cannot be inferred
 
-Variables must always be initialized. (TODO: really? What about arrays? Maybe need special syntax for zero-initialization or mass-initialization)
+Null pointer literal:
+    let p: u32* = null      // special like empty array literal, type cannot be inferred
+
+Variables must always be initialized. (TODO: really? What about arrays? Maybe need special syntax for zero-initialization or mass-initialization. Alternative: default to zero-initialization)
 Const variables must be initialized with a const expression (any expression that doesn't include non-const values).
 
 ======== OPERATORS ========
@@ -79,13 +81,15 @@ Logical (only bool type):
     !x
     x & y
     x | y
+    x && y // short-circuit
+    x || y // short-circuit
     x ^ y
 
-Equality (all built-in types, only same type):
+Equality (all built-in types, all struct types, only same type):
     x == y
     x != y
 
-Comparison (all built-in types, only same type):
+Comparison (all built-in types, all struct types, only same type):
     x < y
     x > y
     x <= y
@@ -95,6 +99,8 @@ Bitwise (integer types, only same type):
     !x
     x & y
     x | y
+    x && y // short-circuit
+    x || y // short-circuit
     x ^ y
 
 Bitwise shift (any pair of integer types):
@@ -119,7 +125,7 @@ Casting:
     x as u32 // always explicit, no implicit casts allowed
 
 Any integer/floating-point types can be cast to each other.
-Any pointer types can be cast to each other (TODO: alignment? UB or safe fallback?).
+Any pointer types can be cast to each other (TODO: alignment? UB or safe fallback? Probably UB.)
 
 Address:
     &x // returns *T, fails if x is a const variable