Decompile C# 15 runtime-async (`/features:runtime-async=on`)#3731

Merged

christophwille merged 16 commits into

icsharpcode:masterfrom

siegfriedpammer:runtime-async

May 21, 2026

Commits on May 20, 2026

Add tests
siegfriedpammer
committed
Add scaffolding for the C# 15 runtime-async lowering.
siegfriedpammer
committed
Handle non-Task task-likes (ValueTask, custom AsyncMethodBuilder) in ILReader async return-type unpacking.

siegfriedpammer
and
claude
committed
Add TransformAsyncHelpersAwaitToAwait to EarlyExpressionTransforms.
siegfriedpammer
committed
Reverse runtime-async lowering of try-finally and try-catch with await.

siegfriedpammer
and
claude
committed
Normalize runtime-async catch filters to recover catch-with-when.

siegfriedpammer
and
claude
committed
Reduce multi-handler runtime-async try-catch back to a multi-handler TryCatch.

siegfriedpammer
and
claude
committed
Reduce runtime-async manual await pattern (non-Task awaitables) to Await.
siegfriedpammer
committed
Recover the this-copy that runtime-async inserts at the entry of struct async methods.

siegfriedpammer
and
claude
committed
Reverse runtime-async flag-based early-return across a try-finally.

siegfriedpammer
and
claude
committed
Cover ConfigureAwait and [MethodImpl(NoInlining)] in the Async pretty test fixture.

siegfriedpammer
and
claude
committed
Reverse runtime-async exception lowering for try-catch nested inside try-finally.
siegfriedpammer
committed
Reverse runtime-async try-finally where the try body always throws.
siegfriedpammer
committed
Generalise runtime-async flag-based early-return for nested try-finally.
siegfriedpammer
committed
Reverse runtime-async multi-handler try-catch dispatched via an if-chain.
siegfriedpammer
committed
Drop the per-call predicate from FindFlagInitStore.
siegfriedpammer
committed

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Decompile C# 15 runtime-async (`/features:runtime-async=on`)#3731

Decompile C# 15 runtime-async (`/features:runtime-async=on`)#3731
christophwille merged 16 commits into
icsharpcode:masterfrom
siegfriedpammer:runtime-async

Commits on May 20, 2026

Add tests

Add scaffolding for the C# 15 runtime-async lowering.

Handle non-Task task-likes (ValueTask, custom AsyncMethodBuilder) in ILReader async return-type unpacking.

Add TransformAsyncHelpersAwaitToAwait to EarlyExpressionTransforms.

Reverse runtime-async lowering of try-finally and try-catch with await.

Normalize runtime-async catch filters to recover catch-with-when.

Reduce multi-handler runtime-async try-catch back to a multi-handler TryCatch.

Reduce runtime-async manual await pattern (non-Task awaitables) to Await.

Recover the this-copy that runtime-async inserts at the entry of struct async methods.

Reverse runtime-async flag-based early-return across a try-finally.

Cover ConfigureAwait and [MethodImpl(NoInlining)] in the Async pretty test fixture.

Reverse runtime-async exception lowering for try-catch nested inside try-finally.

Reverse runtime-async try-finally where the try body always throws.

Generalise runtime-async flag-based early-return for nested try-finally.

Reverse runtime-async multi-handler try-catch dispatched via an if-chain.

Drop the per-call predicate from FindFlagInitStore.