基材油墨！编译错误"function pointers cannot appear in constant functions"

Question

1. 我试着"https://substrate.dev/substrate-contracts-workshop/#/">
2. 我按照教程创建了一个Rust环境
3. 我执行了"；货物+夜间测试">
4. 我收到以下错误

error[E0658]: function pointers cannot appear in constant functions
--> /Users/shin.takahashi/.cargo/git/checkouts/ink-1add513eda8f5a89/cca3154/lang/src/dispatcher.rs:186:30
|
186 |               pub const fn new(dispatchable: $dispatchable_fn<Msg, S>) -> Self {
|                                ^^^^^^^^^^^^
...
237 | / impl_dispatcher_for! {
238 | |     /// Dispatcher for storage preserving messages.
239 | |     struct Dispatcher(DispatchableFn);
240 | | }
| |_- in this macro invocation
|
= note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
= help: add `#![feature(const_fn_fn_ptr_basics)]` to the crate attributes to enable
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

请告诉我怎么了？？？

Answer 1

我无法解决它，但我能够使它变得可编译和可执行。按如下方式更正~/.fargo/git/checkouts/ink-XXXX/cca XXXX/lang/source/dispacher.rs的错误部分。

//pub const fn new(dispatchable: $dispatchable_fn<Msg, S>) -> Self { // before
pub fn new(dispatchable: $dispatchable_fn<Msg, S>) -> Self { // after

Answer 2

墨迹似乎已更新。我运行了货物更新，然后构建了没有错误的合同。

$ testcontract % cargo update
Updating git repository `https://github.com/paritytech/ink`
Updating crates.io index
Updating git repository `https://github.com/type-metadata/type-metadata.git`
Updating aho-corasick v0.7.13 -> v0.7.14
Updating regex v1.3.9 -> v1.4.1
Updating regex-syntax v0.6.18 -> v0.6.20
Updating serde_json v1.0.58 -> v1.0.59
Updating syn v1.0.43 -> v1.0.44
Updating toml v0.5.6 -> v0.5.7
$ testcontract % sh build.sh
[1/4] Collecting crate metadata
[2/4] Building cargo project
Compiling compiler_builtins v0.1.35
Compiling core v0.0.0 (/Users/home/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/src/rust/library/core)
Compiling rustc-std-workspace-core v1.99.0 (/Users/home/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/src/rust/library/rustc-std-workspace-core)
Compiling alloc v0.0.0 (/var/folders/xj/m862kvrj73x04dvsfr6vs_fm0000gn/T/cargo-xbuild8YkYwG)
Finished release [optimized] target(s) in 13.19s
Compiling cfg-if v0.1.10
Compiling serde_json v1.0.59
Compiling byte-slice-cast v0.3.5
Compiling arrayvec v0.5.1
Compiling memory_units v0.4.0
Compiling regex-syntax v0.6.20
Compiling smallvec v1.4.2
Compiling crunchy v0.2.2
Compiling paste v0.1.18
Compiling aho-corasick v0.7.14
Compiling num-traits v0.2.12
Compiling toml v0.5.7
Compiling ink_prelude v2.1.0 (https://github.com/paritytech/ink?tag=latest-v2#cca31543)
Compiling tiny-keccak v2.0.2
Compiling wee_alloc v0.4.5
Compiling ink_alloc v2.1.0 (https://github.com/paritytech/ink?tag=latest-v2#cca31543)
Compiling proc-macro-crate v0.1.5
Compiling parity-scale-codec-derive v1.2.2
Compiling regex v1.4.1
Compiling parity-scale-codec v1.3.5
Compiling ink_primitives v2.1.0 (https://github.com/paritytech/ink?tag=latest-v2#cca31543)
Compiling ink_core_derive v2.1.0 (https://github.com/paritytech/ink?tag=latest-v2#cca31543)
Compiling ink_lang_macro v2.1.0 (https://github.com/paritytech/ink?tag=latest-v2#cca31543)
Compiling ink_core v2.1.0 (https://github.com/paritytech/ink?tag=latest-v2#cca31543)
Compiling ink_lang v2.1.0 (https://github.com/paritytech/ink?tag=latest-v2#cca31543)
Compiling testcontract v0.1.0 (/var/folders/xj/m862kvrj73x04dvsfr6vs_fm0000gn/T/.cargo-contract_rKI7GO)
Finished release [optimized] target(s) in 13.91s
[3/4] Post processing wasm file
[4/4] Optimizing wasm file
Original wasm size: 21.8K, Optimized: 5.0K
Your contract is ready. You can find it here:
/Users/home/projects/testcontract/target/testcontract.wasm