bug: size-of dependency failed to compile on rust nightly-06-18

[fiamma-builder]

Bug Report

**types-rs version: 0.1.7 **

My project depends on starknet-rs, and a warning appeared during compilation. warning: the following packages contain code that will be rejected by a future version of Rust: size-of v0.1.5
note: to see what the problems were, use the option --future-incompat-report, or run cargo report future-incompatibilities --id 1

Then I checked the project's dependency tree, which shows that this size-of is imported by starknet-rs via https://github.com/starknet-io/types-rs , my toolchain version :

 [toolchain]
channel = "nightly-2025-06-05"

Of course, if it were just a warning, it wouldn't be a big deal and would be acceptable. However, when I tried to change the Rust version to nightly-06-18 to compile my project, it directly threw an error with the error message.

  --> /Users/panos/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/size-of-0.1.5/src/macros.rs:66:56
    |
66  |               impl<$($ty,)* U> $crate::SizeOf for extern $cconv fn($($ty),*) -> U {
    |                                                          ^^^^^^
    |
   ::: /Users/panos/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/size-of-0.1.5/src/core_impls.rs:294:1
    |
294 | / impl_function_ptrs! {
295 | |     "C",
296 | |     "Rust",
297 | |     "aapcs",
...   |
303 | |     "fastcall",
304 | | }
    | |_- in this macro invocation
    |
    = note: this error originates in the macro `impl_function_ptrs` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0570]: "win64" is not a supported ABI for the current target
   --> /Users/panos/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/size-of-0.1.5/src/macros.rs:66:56
    |
66  |               impl<$($ty,)* U> $crate::SizeOf for extern $cconv fn($($ty),*) -> U {
    |                                                          ^^^^^^
    |
   ::: /Users/panos/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/size-of-0.1.5/src/core_impls.rs:294:1
    |
294 | / impl_function_ptrs! {
295 | |     "C",
296 | |     "Rust",
297 | |     "aapcs",
...   |
303 | |     "fastcall",
304 | | }
    | |_- in this macro invocation
    |
    = note: this error originates in the macro `impl_function_ptrs` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0570]: "sysv64" is not a supported ABI for the current target
   --> /Users/panos/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/size-of-0.1.5/src/macros.rs:66:56
    |
66  |               impl<$($ty,)* U> $crate::SizeOf for extern $cconv fn($($ty),*) -> U {
    |                                                          ^^^^^^
    |
   ::: /Users/panos/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/size-of-0.1.5/src/core_impls.rs:294:1
    |
294 | / impl_function_ptrs! {
295 | |     "C",
296 | |     "Rust",
297 | |     "aapcs",
...   |
303 | |     "fastcall",
304 | | }
    | |_- in this macro invocation
    |
    = note: this error originates in the macro `impl_function_ptrs` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0570]: "stdcall" is not a supported ABI for the current target
   --> /Users/panos/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/size-of-0.1.5/src/macros.rs:66:56
    |
66  |               impl<$($ty,)* U> $crate::SizeOf for extern $cconv fn($($ty),*) -> U {
    |                                                          ^^^^^^
    |
   ::: /Users/panos/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/size-of-0.1.5/src/core_impls.rs:294:1
    |
294 | / impl_function_ptrs! {
295 | |     "C",
296 | |     "Rust",
297 | |     "aapcs",
...   |
303 | |     "fastcall",
304 | | }
    | |_- in this macro invocation
    |
    = help: if you need `extern "stdcall"` on win32 and `extern "C"` everywhere else, use `extern "system"`
    = note: this error originates in the macro `impl_function_ptrs` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0570]: "fastcall" is not a supported ABI for the current target
   --> /Users/panos/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/size-of-0.1.5/src/macros.rs:66:56
    |
66  |               impl<$($ty,)* U> $crate::SizeOf for extern $cconv fn($($ty),*) -> U {
    |                                                          ^^^^^^
    |
   ::: /Users/panos/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/size-of-0.1.5/src/core_impls.rs:294:1
    |
294 | / impl_function_ptrs! {
295 | |     "C",
296 | |     "Rust",
297 | |     "aapcs",
...   |
303 | |     "fastcall",
304 | | }
    | |_- in this macro invocation
    |
    = note: this error originates in the macro `impl_function_ptrs` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0570

[tdelabro]

@fiamma-builder can you improve this issue by adding some error messages and maybe context?

[fiamma-builder]

ok, I have updated more description information

[tdelabro]

@fiamma-builder thanks, I went to ask on the size-of repo maintainer if he plans to update his crate to fix that

[mkaput]

FYI annoyingly, any public crate that depends on starknet-types-core won't appear on docs.rs until this is fixed: https://docs.rs/crate/cairo-oracle-server/0.1.0/builds/2322240

[mkaput]

What is size-of crate used for? I see this crate just provides impl for its traits. Perhaps, depending on the usage place, could #123 just be reverted? It doesn't provide any reference what uses it, and I cannot trace anything on GitHub...

[tdelabro]

fixed by #140

[mkaput]

awesome! waiting for release