Limits

No loops

There is no for. The keywords is reserved, but writing it fails to compile. Repetition is done by recursion. Loops are the most requested missing feature.

Data structures

• No strings beyond the basics. You can store them, print them, read them with input, and convert them to numbers, but there's no slicing, indexing, joining, or length.

Functions

• No overloading. Two functions can't share a name, and imported names can collide.
• No function values. You can't store a function in a variable or pass one to another function.
• Functions must be defined before use in the file. There is no forward declaration.

Safety

• Runtime errors need debug mode. Division by zero and bad string-to-number casts only error when you pass --debug; otherwise the behavior is undefined. See Debug.
• Missing struct fields are garbage. Point(x=3) compiles and p.y is whatever memory happens to hold. See Structs.
• Unary plus doesn't work