Added methods to check if a type is a number

analyzer/literals.go

@@ -42,23 +42,11 @@ func (literal IntLiteral) What () (what Type) {
 // canBePassedAs returns true if this literal can be implicitly cast to the
 // specified type, and false if it can't.
 func (literal IntLiteral) canBePassedAs (what Type) (allowed bool) {
-	// must be a singlular value
+	// can be passed to singular types that are signed numbers at a
-	if !what.isSingular() { return }
+	// primitive level.
-	
+	allowed =
-	// can be passed to types that are signed numbers at a primitive level.
+		what.isSingular() &&
-	primitive := what.underlyingPrimitive()
+		what.isSignedNumeric()
-	switch primitive {
-	case
-		&PrimitiveF64,
-		&PrimitiveF32,
-		&PrimitiveI64,
-		&PrimitiveI32,
-		&PrimitiveI16,
-		&PrimitiveI8,
-		&PrimitiveInt:
-
-		allowed = true
-	}
 	return
 }