Mark std feature in cosmwasm-std as deprecated

Author: aumetra

packages/std/Cargo.toml

@@ -12,13 +12,15 @@ readme = "README.md"
 features = ["abort", "stargate", "staking", "cosmwasm_2_0"]
 
 [features]
-default = ["iterator", "abort", "std"]
+default = ["iterator", "abort"]
 abort = []
-# This feature can be used in the future to provide support for no_std environments,
-# but disabling it will not provide any benefit at the moment. Even with this feature disabled,
-# we currently require an std environment.
-# You probably want to keep this enabled for now to avoid possible breaking changes later.
-std = ["serde/std", "serde-json-wasm/std"]
+# LEGACY. REMOVE NEXT BREAKING RELEASE.
+#
+# This feature is unused. This library is not intended to run without the `std` library.
+# Use `cosmwasm-core` instead if you *really* need a `no_std` environment.
+#
+# If you need any types exclusive to `cosmwasm-std` in a `no_std` environment, open an issue to discuss moving it to `cosmwasm-core`.
+std = []
 # iterator allows us to iterate over all DB items in a given range
 # optional as some merkle stores (like tries) don't support this
 # given Ethereum 1.0, 2.0, Substrate, and other major projects use Tries
@@ -58,8 +60,8 @@ derive_more = { version = "1.0.0-beta.6", default-features = false, features = [
 hex = "0.4"
 schemars = { workspace = true }
 sha2 = "0.10.3"
-serde = { workspace = true }
-serde-json-wasm = { version = "1.0.1", default-features = false }
+serde = { workspace = true, features = ["std"] }
+serde-json-wasm = { version = "1.0.1", default-features = false, features = ["std"] }
 thiserror = "1.0.26"
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]

packages/std/src/lib.rs

@@ -1,12 +1,6 @@
+#[macro_use]
 extern crate alloc;
 
-#[cfg(not(feature = "std"))]
-core::compile_error!(
-    r#"Please enable `cosmwasm-std`'s `std` feature, as we might move existing functionality to that feature in the future.
-Builds without the std feature are currently not expected to work. If you need no_std support see #1484.
-"#
-);
-
 // Exposed on all platforms
 
 mod assertions;
@@ -117,6 +111,15 @@ pub mod testing;
 pub use cosmwasm_core as core;
 pub use cosmwasm_core::CoreError as StdError;
 pub use cosmwasm_core::CoreResult as StdResult;
-pub use cosmwasm_core::*;
+pub use cosmwasm_core::{
+    assert_approx_eq, from_base64, from_hex, instantiate2_address, to_base64, to_hex, Addr, Binary,
+    CanonicalAddr, CheckedFromRatioError, CheckedMultiplyFractionError, CheckedMultiplyRatioError,
+    CoinFromStrError, CoinsError, ConversionOverflowError, Decimal, Decimal256,
+    Decimal256RangeExceeded, DecimalRangeExceeded, DivideByZeroError, DivisionError, Fraction,
+    HexBinary, Instantiate2AddressError, Int128, Int256, Int512, Int64, Isqrt, OverflowError,
+    OverflowOperation, RecoverPubkeyError, SignedDecimal, SignedDecimal256,
+    SignedDecimal256RangeExceeded, SignedDecimalRangeExceeded, SystemError, Uint128, Uint256,
+    Uint512, Uint64, VerificationError,
+};
 
 pub use cosmwasm_derive::entry_point;

packages/std/src/prelude.rs

@@ -1,6 +1,3 @@
 pub use alloc::boxed::Box;
-pub use alloc::format;
 pub use alloc::string::{String, ToString};
-pub use alloc::vec;
 pub use alloc::vec::Vec;
-pub use core::option::Option::{self, None, Some};

packages/std/src/testing/mock.rs

@@ -227,7 +227,6 @@ impl Api for MockApi {
     }
 
     fn debug(&self, #[allow(unused)] message: &str) {
-        #[cfg(feature = "std")]
         println!("{message}");
     }
 }
@@ -2453,7 +2452,7 @@ mod tests {
     }
 
     #[test]
-    #[cfg(all(feature = "cosmwasm_1_3", feature = "std"))]
+    #[cfg(feature = "cosmwasm_1_3")]
     fn distribution_querier_new_works() {
         let addresses = [
             ("addr0000".to_string(), "addr0001".to_string()),