How much Kotlin does it actually run?
Every number below comes from running the official Kotlin compiler
test suite — JetBrains/kotlin,
the compiler/testData/codegen/box,
boxInline, and boxWasmJsInterop corpora,
every file in them — through minikotlin unmodified: each
.kt compiles to WebAssembly, runs, and its output is checked against the
expected OK. Nothing is hand-picked and nothing is dropped for being
inconvenient — a test minikotlin cannot handle is counted against it, with the
missing feature named.
Coverage across the official suite
Each row is a feature area / directory from the official corpora. The bar is the split of supported / not-yet-supported / out-of-scope for that area — filter and sort to explore where the compiler is strong and where the work remains.
Why the rest is not yet run
Declined tests are never silently dropped — each is attributed to a specific unimplemented language feature. These are the top 60 reasons by test count.