language features

IMPLEMENTED

exact-width i8 through i64, u8 through u64, f32, f64, isize, usize, void, and inferred integer-constrained int
target-dependent atomic C primitives from c_char through c_longdouble
C primitives remain semantically distinct from exact-width Brolang primitives until target lowering
contextual integer literals and constant folding of addition and negation trees
strict numeric conversions, checked integer addition, and unary negation
arrays [N]T, sentinel arrays [N;S]T, single-item pointers @T, many-item pointers *T, sentinel many-item pointers [*;S]T, pointer offsets, slices, and explicit slicing
immutable UTF-8 string literals typed as pointers to static sentinel arrays: @[N;0]u8
pointer-to-array .len, indexing, and slicing without explicit dereference
arrays expose .len but not .ptr; slices and pointers-to-arrays expose .ptr and preserve sentinel information when available
information-preserving and information-forgetting pointer-to-array decay and sentinel slice/pointer weakening; array values never implicitly decay
narrow immutable zero-terminated byte pointer conversion to *c_char and [*;0]c_char, without general u8/c_char interchange
optionals with trapping postfix ?, orelse, and nullable pointer representation
source-order native structs, keyed literals, and defined or opaque pointer-only c_struct
postfix pointer dereference, general writable locations, function calls, assignments, and returns

demand-monomorphized functions
bodyful c_func definitions using the c calling convention
bodyless c_func declarations with exact, globally unique external symbol names
concrete-only foreign signatures
Apple Silicon C ABI scalar and pointer lowering, including narrow integer extension attributes
directory packages with merged declarations
file-local relative imports, aliases, and qualified member access
relative .h imports as synthetic package namespaces
transitive external C function prototypes, typedef chains, C scalars, and pointers to opaque C records
bodyless manual and imported C variadic declarations with target-aware default argument promotions
reference-time diagnostics for unsupported imported C declarations

error-tolerant compilation with runtime diagnostic traps
lazy semantic checking of demanded function specializations
demand-driven LLVM declarations for referenced foreign functions
ordered linking of additional c sources, objects, and libraries
replaceable dynamically loaded libclang C-import backend
per-compilation C-header import caching by canonical path, target, ordered include paths, and ordered defines
static, eager runtime, and deferred problematic globals

C enums, external variables, function pointers, callbacks, macros, and static inline functions
target-specific by-value C record and union ABI lowering