What's Changed

• Remove support for namespace attribute by @IGI-111 in https://github.com/FuelLabs/sway/pull/6279
• Make module name mandatory and private by @jjcnn in https://github.com/FuelLabs/sway/pull/6271
• Cache Build Plans in language server by @JoshuaBatty in https://github.com/FuelLabs/sway/pull/6281
• Forbid configurables in pattern matching and shadowing by @ironcev in https://github.com/FuelLabs/sway/pull/6289
• feat: Enhance forc-deploy UX with dialoguer by @sdankel in https://github.com/FuelLabs/sway/pull/6278
• cache pid lock files to reduce IO operations by @JoshuaBatty in https://github.com/FuelLabs/sway/pull/6297
• Add documentation about Undefined Behavior by @IGI-111 in https://github.com/FuelLabs/sway/pull/6302
• fix: update the document link for Manual Storage Management. by @dima-safin-2025 in https://github.com/FuelLabs/sway/pull/6301
• Add core and std dependency test filtering to the test runner by @tritao in https://github.com/FuelLabs/sway/pull/6299
• chore: correction typos index.md by @osrm in https://github.com/FuelLabs/sway/pull/6303
• Re-pin LSP tests to published version of std and re-enable commented out tests by @JoshuaBatty in https://github.com/FuelLabs/sway/pull/6315
• chore: bump forc-pkg deps and fix clippy warnings by @JoshuaBatty in https://github.com/FuelLabs/sway/pull/6311
• Fix range OOB bug in the language server by @JoshuaBatty in https://github.com/FuelLabs/sway/pull/6314
• Additionally test associated constants by @ironcev in https://github.com/FuelLabs/sway/pull/6349
• Support for slice new syntax &[T] by @xunilrj in https://github.com/FuelLabs/sway/pull/6307
• Correct code_size function implementation by @SwayStar123 in https://github.com/FuelLabs/sway/pull/6304
• Introduce a new symbol resolving pass by @tritao in https://github.com/FuelLabs/sway/pull/5809
• Revert when loading 0 size typed storagevec by @SwayStar123 in https://github.com/FuelLabs/sway/pull/6358
• Slice/Array intrinsics: __slice and __elem_at by @xunilrj in https://github.com/FuelLabs/sway/pull/6282
• Move std-lib StorageKey tests to in-language tests by @bitzoic in https://github.com/FuelLabs/sway/pull/6363
• feat: create and deploy a reference proxy contract for contracts with [proxy] enabled by @kayagokalp in https://github.com/FuelLabs/sway/pull/6069
• Fixes assert in type_check_encode_buffer_empty. by @esdrubal in https://github.com/FuelLabs/sway/pull/6364
• Fixes crash on encode_buffer_append with wrong args. by @esdrubal in https://github.com/FuelLabs/sway/pull/6365
• docs: Update docs for forc-client by @sdankel in https://github.com/FuelLabs/sway/pull/6403
• fix size of configurable buffer for enums by @xunilrj in https://github.com/FuelLabs/sway/pull/6366
• Add error for duplicate struct field initialization by @IGI-111 in https://github.com/FuelLabs/sway/pull/6401
• Fixes unreachable macro crashing compiler. by @esdrubal in https://github.com/FuelLabs/sway/pull/6362
• ASM blocks handling: inlining, DCE, ASM returns without return register by @ironcev in https://github.com/FuelLabs/sway/pull/6404
• Fix broken documentation link by @IGI-111 in https://github.com/FuelLabs/sway/pull/6400
• Fix bugs in memcpyopt by @vaivaswatha in https://github.com/FuelLabs/sway/pull/6359
• Revert when overflow using pow for u8, u16, u32 by @SwayStar123 in https://github.com/FuelLabs/sway/pull/6340
• Allow forc deploy to submit transaction without waiting for commit confirmation by @luisburigo in https://github.com/FuelLabs/sway/pull/6294
• Filter ABI supertrait methods from contract entry generation by @tritao in https://github.com/FuelLabs/sway/pull/6402
• Fix impl self node order dependency pass key collision issue. by @tritao in https://github.com/FuelLabs/sway/pull/6407
• Implement mutability checks for references to aggregate type fields. by @tritao in https://github.com/FuelLabs/sway/pull/6415
• Updates JSON ABI, LDC, BSIZ, BLDD and ED19. by @esdrubal in https://github.com/FuelLabs/sway/pull/6254
• Implement Typed Module Caching by @JoshuaBatty in https://github.com/FuelLabs/sway/pull/6280
• Better checks at type_check_analyze by @xunilrj in https://github.com/FuelLabs/sway/pull/6410
• Update README.md by @sdankel in https://github.com/FuelLabs/sway/pull/6423
• Allow variable length message in ed_verify by @SwayStar123 in https://github.com/FuelLabs/sway/pull/6419
• Increase Safety when introspecting transaction inputs by @bitzoic in https://github.com/FuelLabs/sway/pull/6405
• Increase Safety when introspecting transactions by @bitzoic in https://github.com/FuelLabs/sway/pull/6418
• Increase Safety when introspecting transaction outputs by @bitzoic in https://github.com/FuelLabs/sway/pull/6414
• Update rust version in forc docker image by @Voxelot in https://github.com/FuelLabs/sway/pull/6422
• chore: bump sdk version by @sdankel in https://github.com/FuelLabs/sway/pull/6430
• feat: Implement ldc based automatic contract chunking by @kayagokalp in https://github.com/FuelLabs/sway/pull/6250
• fix: use proxy bin with storage slots in a namespace by @kayagokalp in https://github.com/FuelLabs/sway/pull/6429
• Fix broken forc command docs by @JoshuaBatty in https://github.com/FuelLabs/sway/pull/6424
• Fix scwq instruction and "phantom" error in purity checks by @ironcev in https://github.com/FuelLabs/sway/pull/6432
• chore: bump to 0.63.0 by @sdankel in https://github.com/FuelLabs/sway/pull/6421

New Contributors

• @dima-safin-2025 made their first contribution in https://github.com/FuelLabs/sway/pull/6301
• @osrm made their first contribution in https://github.com/FuelLabs/sway/pull/6303
• @luisburigo made their first contribution in https://github.com/FuelLabs/sway/pull/6294

Breaking changes

• the #[namespace()] attribute is no longer supported. The new namespace syntax is preferred moving forward and the new in keyword usage can be used for backwards compatibility
• Configurables are no longer allowed in pattern matching and shadowing
• There have been significant changes the the ABI specification format
• ed_verify has been changed to support variable length messages
• some std functions now return an Option instead or reverting
• some std functions now return types updated to match the specification
• some std functions have been made private are will no longer be available

Full Changelog: https://github.com/FuelLabs/sway/compare/v0.62.0...v0.63.0