Keyword Use
moduleName the file’s module useImport names; embed fields; bring fields into scope lib, asDeclare C functions (use lib "x" as y); as also casts pubExport an item fnFunction or method struct, enumTypes constModule constant letLocal variable (always mutable) if, elseBranch, or a value while, for, inLoops matchBranch on an enum return, break, continueLeave a function or loop deferRun at end of block operatorDefine an operator method thisMethod receiver
Integers int (= i64), i8, i16, i32, i64, u8, u16, u32, u64Floats float (= f64), f32, f64Other bool, void, string, ptr, cstrArrays [N]T (fixed), []T (slice)Pointers &TFunctions fn(A, B): R
Attribute Meaning
#[Debug]Printable in string interpolation #[TryCatch(Ok, Err)]Enum works with ? #[singleton]Process-wide value #[thread]Per-thread (with #[singleton]) #[shader] #[vertex] #[varying] #[uniform] #[flat]Shader code and data (Shaders )
@sizeof, @slice, @syscall, @atomicLoad, @atomicStore, @atomicAdd, @atomicSub, @atomicExchange, @atomicCas, @vmin, @vmax, @vsqrt, @vabs, @vsum, @vshuffle, @vfloat, @vint, @vload, @vstore, @script, @j3ui, @uiChoice, and the shader builtins and @shader (Shaders )
Arithmetic + - * / %Bits (integers) & | ^ ~ << >>Compare == != < <= > >=Logic && || !Assign = += -= *= /= %= &= |= ^=Pointers &x (address), *p (deref)Ranges a..b, a..=b, xs[a..b], xs[:]Errors expr?
No interfaces or inheritance; traits are structural (a type has the methods, no impl blocks). Closures cannot escape (no heap environments): a closure(..) is a parameter or a let. No garbage collector or borrow checker. No null and no exceptions. No mutable globals besides #[singleton].