* cli: Add `anchor clean` command that's the same as `cargo clean` but preserves keypairs inside `target/deploy` ([#1470](https://github.com/project-serum/anchor/issues/1470)).
* ts: Mark `transaction`, `instruction`, `simulate` and `rpc` program namespaces as deprecated in favor of `methods` ([#1539](https://github.com/project-serum/anchor/pull/1539)).
* ts: No longer allow manual setting of globally resolvable program public keys in `methods#accounts()`. ([#1548][https://github.com/project-serum/anchor/pull/1548])
* lang: Handle array sizes with variable sizes in events and array size casting in IDL parsing ([#1485](https://github.com/project-serum/anchor/pull/1485))
* lang: add [`error!`](https://docs.rs/anchor-lang/latest/anchor_lang/prelude/macro.error.html) and [`err!`](https://docs.rs/anchor-lang/latest/anchor_lang/prelude/macro.err.html) macro and `Result` type ([#1462](https://github.com/project-serum/anchor/pull/1462)).
This change will break most programs. Do the following to upgrade:
* change all `Err(MyError::SomeError.into())` to `Err(error!(MyError::SomeError))` and all `Err(ProgramError::SomeProgramError)` to `Err(ProgramError::SomeProgramError.into())` or `Err(Error::from(ProgramError::SomeProgramError).with_source(source!()))` to provide file and line source of the error (`with_source` is most useful with `ProgramError`s. `error!` already adds source information for custom and anchor internal errors).
* change all `solana_program::program::invoke()` to `solana_program::program::invoke().map_err(Into::into)` and `solana_program::program::invoke_signed()` to `solana_program::program::invoke_signed().map_err(Into::into)`
* ts: Fix the root type declaration of the `Wallet` / `NodeWallet` class ([#1363](https://github.com/project-serum/anchor/pull/1363)).
* ts: Improve type mapping of Account fields into Typescript with additional support for `Option<T>` and `Vec<String>` types ([#1393](https://github.com/project-serum/anchor/pull/1393)).
* lang: Add `seeds::program` constraint for specifying which program_id to use when deriving PDAs ([#1197](https://github.com/project-serum/anchor/pull/1197)).
* lang: `Context` now has a new `bumps: BTree<String, u8>` argument, mapping account name to bump seed "found" by the accounts context. This allows one to access bump seeds without having to pass them in from the client or recalculate them in the handler ([#1367](https://github.com/project-serum/anchor/pull/1367)).
* ts: Remove error logging in the event parser when log websocket encounters a program error ([#1313](https://github.com/project-serum/anchor/pull/1313)).
* ts: Add new `methods` namespace to the program client, introducing a more ergonomic builder API ([#1324](https://github.com/project-serum/anchor/pull/1324)).
* cli: Expose the solana-test-validator --account flag in Anchor.toml via [[test.validator.account]] ([#1366](https://github.com/project-serum/anchor/pull/1366)).
* lang: The `Accounts` trait's `try_accounts` method now has an additional `bumps: &mut BTreeMap<String, u8>` argument, which accumulates bump seeds ([#1367](https://github.com/project-serum/anchor/pull/1367)).
* lang: Providing `bump = <target>` targets with `init` will now error. On `init` only, it is required to use `bump` without a target and access the seed inside function handlers via `ctx.bumps.get("<pda-account-name")`. For subsequent seeds constraints (without init), it is recommended to store the bump on your account and use it as a `bump = <target>` target to minimize compute units used ([#1380](https://github.com/project-serum/anchor/pull/1380)).
* ts: `Coder` is now an interface and the existing class has been renamed to `BorshCoder`. This change allows the generation of Anchor clients for non anchor programs ([#1259](https://github.com/project-serum/anchor/pull/1259/files)).
* lang: Improved error msgs when required programs are missing when using the `init` constraint([#1257](https://github.com/project-serum/anchor/pull/1257))
* ts: fix `translateAddress` which currently leads to failing browser code. Now uses `PublicKey` constructor instead of prototype chain constructor name checking which doesn't work in the presence of code minifying/mangling([#1138](https://github.com/project-serum/anchor/pull/1138))
* lang: add missing check that verifies that account is ATA when using `init_if_needed` and init is not needed([#1221](https://github.com/project-serum/anchor/pull/1221))
* lang: Add `programdata_address: Option<Pubkey>` field to `Program` account. Will be populated if account is a program owned by the upgradable bpf loader ([#1125](https://github.com/project-serum/anchor/pull/1125))
* lang,ts,ci,cli,docs: update solana toolchain to version 1.8.5([#1133](https://github.com/project-serum/anchor/pull/1133)).
* lang: Account wrappers for non-Anchor programs no longer have to implement the `serialize` function because it has a default impl now. Similarly, they no longer have to implement `try_deserialize` which now delegates to `try_deserialize_unchecked` by default([#1156](https://github.com/project-serum/anchor/pull/1156)).
* lang: Add `set_inner` method to `Account<'a, T>` to enable easy updates ([#1177](https://github.com/project-serum/anchor/pull/1177)).
* client: Client::new and Client::new_with_options now accept `Rc<dyn Signer>` instead of `Keypair` ([#975](https://github.com/project-serum/anchor/pull/975)).
* lang, ts: Change error enum name and message for 'wrong program ownership' account validation ([#1154](https://github.com/project-serum/anchor/pull/1154)).
* cli: Add version number from programs `Cargo.toml` into extracted IDL ([#1061](https://github.com/project-serum/anchor/pull/1061)).
* lang: Add `deprecated` attribute to `Loader`([#1078](https://github.com/project-serum/anchor/pull/1078)).
* lang: the `init_if_needed` attribute now checks that given attributes (e.g. space, owner, token::authority etc.) are validated even when init is not needed ([#1096](https://github.com/project-serum/anchor/pull/1096)).
* lang: Add `ErrorCode::AccountNotInitialized` error to separate the situation when the account has the wrong owner from when it does not exist (#[1024](https://github.com/project-serum/anchor/pull/1024)).
* lang: Called instructions now log their name by default. This can be turned off with the `no-log-ix-name` flag ([#1057](https://github.com/project-serum/anchor/pull/1057)).
* lang: `ProgramData` and `UpgradableLoaderState` can now be passed into `Account` as generics. see [UpgradeableLoaderState](https://docs.rs/solana-program/latest/solana_program/bpf_loader_upgradeable/enum.UpgradeableLoaderState.html). `UpgradableLoaderState` can also be matched on to get `ProgramData`, but when `ProgramData` is used instead, anchor does the serialization and checking that it is actually program data for you ([#1095](https://github.com/project-serum/anchor/pull/1095)).
* ts: Add better error msgs in the ts client if something wrong (i.e. not a pubkey or a string) is passed in as an account in an instruction accounts object ([#1098](https://github.com/project-serum/anchor/pull/1098)).
* ts: Add inputs `postInstructions` and `preInstructions` as a replacement for (the now deprecated) `instructions` ([#1007](https://github.com/project-serum/anchor/pull/1007)).
* ts: Add `getAccountInfo` helper method to account namespace/client ([#1084](https://github.com/project-serum/anchor/pull/1084)).
* lang, ts: Error codes have been mapped to new numbers to allow for more errors per namespace ([#1096](https://github.com/project-serum/anchor/pull/1096)).
* lang: Add `SystemAccount<'info>` account type for generic wallet addresses or accounts owned by the system program ([#954](https://github.com/project-serum/anchor/pull/954))
* cli: `target/types` directory now created on build to store a TypeScript types file for each program's IDL ([#795](https://github.com/project-serum/anchor/pull/795)).
* ts: `Program<T>` can now be typed with an IDL type ([#795](https://github.com/project-serum/anchor/pull/795)).
* lang: Add `mint::freeze_authority` keyword for mint initialization within `#[derive(Accounts)]` ([#835](https://github.com/project-serum/anchor/pull/835)).
* lang: Add `#[account(init_if_needed)]` keyword for allowing one to invoke the same instruction even if the account was created already ([#906](https://github.com/project-serum/anchor/pull/906)).
* lang: Add custom errors support for `signer`, `mut`, `has_one`, `owner`, raw constraints and `address` ([#905](https://github.com/project-serum/anchor/pull/905), [#913](https://github.com/project-serum/anchor/pull/913)).
* lang: Accounts marked with the `#[account(signer)]` constraint now enforce signer when the `"cpi"` feature is enabled ([#849](https://github.com/project-serum/anchor/pull/849)).
* cli: Add `localnet` command for starting a local `solana-test-validator` with the workspace deployed ([#820](https://github.com/project-serum/anchor/pull/820)).
*`CpiContext` accounts must now be used with the accounts struct generated in the `crate::cpi::accounts::*` module. These structs correspond to the accounts context for each instruction, except that each field is of type `AccountInfo` ([#824](https://github.com/project-serum/anchor/pull/824)).
* lang: Add new `Account` type to replace `ProgramAccount` and `CpiAccount`, both of which are deprecated ([#686](https://github.com/project-serum/anchor/pull/686)).
* lang: `#[associated]` and `#[account(associated = <target>, with = <target>)]` are both removed ([#612](https://github.com/project-serum/anchor/pull/612)).
* lang: `#[account(init)]` now creates the account inside the same instruction to be consistent with initializing PDAs. To maintain the old behavior of `init`, replace it with `#[account(zero)]` ([#641](https://github.com/project-serum/anchor/pull/641)).
* lang: `bump` must be provided when using the `seeds` constraint. This has been added as an extra safety constraint to ensure that whenever a PDA is initialized via a constraint the bump used is the one created by `Pubkey::find_program_address` ([#641](https://github.com/project-serum/anchor/pull/641)).
* lang: `try_from_init` has been removed from `Loader`, `ProgramAccount`, and `CpiAccount` and replaced with `try_from_unchecked` ([#641](https://github.com/project-serum/anchor/pull/641)).
* lang: `try_from` methods for `ProgramAccount`, `Loader`, and `ProgramState` now take in an additional `program_id: &Pubkey` parameter ([#660](https://github.com/project-serum/anchor/pull/660)).
* cli: Adds a `[registry]` section in the Anchor toml ([#570](https://github.com/project-serum/anchor/pull/570)).
* cli: Adds the `anchor login <api-token>` command ([#570](https://github.com/project-serum/anchor/pull/570)).
* cli: Adds the `anchor publish <package>` command ([#570](https://github.com/project-serum/anchor/pull/570)).
* cli: Adds a root level `anchor_version` field to the Anchor.toml for specifying the anchor docker image to use for verifiable builds ([#570](https://github.com/project-serum/anchor/pull/570)).
* cli: Adds a root level `solana_version` field to the Anchor.toml for specifying the solana toolchain to use for verifiable builds ([#570](https://github.com/project-serum/anchor/pull/570)).
* cli: `[clusters.<network>]` Anchor.toml section has been renamed to `[programs.<network>]` ([#570](https://github.com/project-serum/anchor/pull/570)).
* cli: `[workspace]` member and exclude arrays must now be filepaths relative to the workpsace root ([#570](https://github.com/project-serum/anchor/pull/570)).
* lang: Adds `require` macro for specifying assertions that return error codes on failure ([#483](https://github.com/project-serum/anchor/pull/483)).
* lang: Allow one to specify arbitrary programs as the owner when creating PDA ([#483](https://github.com/project-serum/anchor/pull/483)).
* lang: A new `bump` keyword is added to the accounts constraints, which is used to add an optional bump seed to the end of a `seeds` array. When used in conjunction with *both*`init` and `seeds`, then the program executes `find_program_address` to assert that the given bump is the canonical bump ([#483](https://github.com/project-serum/anchor/pull/483)).
* lang: Add feature flag for using the old state account discriminator. This is a temporary flag for those with programs built prior to v0.7.0 but want to use the latest Anchor version. Expect this to be removed in a future version ([#446](https://github.com/project-serum/anchor/pull/446)).
* lang: Add `#[account(address = <expr>)]` constraint for asserting the address of an account ([#400](https://github.com/project-serum/anchor/pull/400)).
* lang: Add `#[account(init, token = <mint-target>, authority = <token-owner-target>...)]` constraint for initializing SPL token accounts as program derived addresses for the program. Can be used when initialized via `seeds` or `associated` ([#400](https://github.com/project-serum/anchor/pull/400)).
* lang: Add `associated_seeds!` macro for generating signer seeds for CPIs signed by an `#[account(associated = <target>)]` account ([#400](https://github.com/project-serum/anchor/pull/400)).
* cli: Add `[scripts]` section to the Anchor.toml for specifying workspace scripts that can be run via `anchor run <script>` ([#400](https://github.com/project-serum/anchor/pull/400)).
* cli: `[clusters.<network>]` table entries can now also use `{ address = <base58-str>, idl = <filepath-str> }` to specify workspace programs ([#400](https://github.com/project-serum/anchor/pull/400)).
* lang: Add `#[account(close = <destination>)]` constraint for closing accounts and sending the rent exemption lamports to a specified destination account ([#371](https://github.com/project-serum/anchor/pull/371)).
* lang: Allows one to use `remaining_accounts` with `CpiContext` by implementing the `ToAccountMetas` trait on `CpiContext` ([#351](https://github.com/project-serum/anchor/pull/351/files)).
* lang, ts: Framework defined error codes are introduced, reserving error codes 0-300 for Anchor, and 300 and up for user defined error codes ([#354](https://github.com/project-serum/anchor/pull/354)).
* lang: `constraint = <expression>` added as a replacement for (the now deprecated) string literal constraints ([#341](https://github.com/project-serum/anchor/pull/341)).
* lang: Span information is now preserved, providing informative compiler error messages ([#341](https://github.com/project-serum/anchor/pull/341)).
* ts: Address metadata is now optional for `anchor.workspace` clients ([#310](https://github.com/project-serum/anchor/pull/310)).
* ts: Retrieving deserialized accounts from the `<program>.account.<my-account>` and `<program>.state` namespaces now require explicitly invoking the `fetch` API. For example, `program.account.myAccount(<adddress>)` and `program.state()` is now `program.account.myAccount.fetch(<address>)` and `program.state.fetch()` ([#322](https://github.com/project-serum/anchor/pull/322)).
* lang: `#[account(associated)]` now requires `init` to be provided to create an associated account. If not provided, then the address will be assumed to exist, and a constraint will be added to ensure the correctness of the address ([#318](https://github.com/project-serum/anchor/pull/318)).
* lang, ts: Change account discriminator pre-image of the `#[state]` account discriminator to be namespaced by "state:" ([#320](https://github.com/project-serum/anchor/pull/320)).
* lang, ts: Change domain delimiters for the pre-image of the instruciton sighash to be a single colon `:` to be consistent with accounts ([#321](https://github.com/project-serum/anchor/pull/321)).
* lang: Associated constraints no longer automatically implement `mut` ([#341](https://github.com/project-serum/anchor/pull/341)).
* lang: Associated `space` constraints must now be literal integers instead of literal strings ([#341](https://github.com/project-serum/anchor/pull/341)).
* ts: Replace deprecated `web3.Account` with `web3.Signer` in public APIs ([#296](https://github.com/project-serum/anchor/pull/296)).
* ts: Generated `anchor.workspace` clients can now be customized per network with `[cluster.<slug>]` in the Anchor.toml ([#308](https://github.com/project-serum/anchor/pull/308)).
* cli: Add `anchor shell` command to spawn a node shell populated with an Anchor.toml based environment ([#303](https://github.com/project-serum/anchor/pull/303)).
* cli: The Anchor.toml's `wallet` and `cluster` settings must now be under the `[provider]` table ([#305](https://github.com/project-serum/anchor/pull/305)).
* client: Renames `RequestBuilder::new` to `RequestBuilder::from` ([#248](https://github.com/project-serum/anchor/pull/248)).
* lang: Renames the generated `instruction::state::Ctor` struct to `instruction::state::New` ([#248](https://github.com/project-serum/anchor/pull/248)).
* lang: Zero copy deserialization for accounts ([#202](https://github.com/project-serum/anchor/pull/202), [#206](https://github.com/project-serum/anchor/pull/206)).
* lang, cli, ts: Add `#[account(associated = <target>)]` and `#[associated]` attributes for creating associated program accounts within programs. The TypeScript package can fetch these accounts with a new `<program>.account.<account-name>.associated` (and `associatedAddress`) method ([#186](https://github.com/project-serum/anchor/pull/186)).
* lang, spl, cli: Upgrade solana toolchain to 1.6.3, a major version upgrade even though only the minor version is incremented. This allows for the removal of `-#![feature(proc_macro_hygiene)]`. ([#139](https://github.com/project-serum/anchor/pull/139)).
* ts: Allow preloading instructions for state rpc transactions ([cf9c84](https://github.com/project-serum/anchor/commit/cf9c847e4144989b5bc1936149d171e90204777b)).
* ts: Export sighash coder function ([734c75](https://github.com/project-serum/anchor/commit/734c751882f43beec7ea3f0f4d988b502e3f24e4)).
* cli: Specify programs to embed into local validator genesis via Anchor.toml while testing ([b3803a](https://github.com/project-serum/anchor/commit/b3803aec03fbbae1a794c9aa6a789e6cb58fda99)).
* cli: Allow skipping the creation of a local validator when testing against localnet ([#93](https://github.com/project-serum/anchor/pull/93)).
* cli: Embed workspace programs into local validator genesis when testing ([733ec3](https://github.com/project-serum/anchor/commit/733ec300b0308e7d007873b0975585d836333fd4)).
* cli: Stream program logs to `.anchor/program-logs` directory when testing ([ce5ca7](https://github.com/project-serum/anchor/commit/ce5ca7ddab6e0fd579deddcd02094b3f798bbe6a)).
* lang/syn: Allow state structs that don't have a ctor or impl block (just trait implementations) ([a78000](https://github.com/project-serum/anchor/commit/a7800026833d64579e5b19c90d724ecc20d2a455)).
* ts: Add instruction method to state namespace ([627c27](https://github.com/project-serum/anchor/commit/627c275e9cdf3dafafcf44473ba8146cc7979d44)).