cargo can't find rustc-demangle in a local-registry

[bdonlan]

if you declare a package with a (direct or indirect) dependency on rustc-demangle:

% cat Cargo.toml
[package]
name = "testcargo"
version = "0.1.0"
authors = ["Bryan Donlan <[email protected]>"]
edition = "2018"

[dependencies]
"rustc-demangle" = "0.1.13"

and then build a local-registry:

% cargo local-registry -s Cargo.toml local-registry
    Updating crates.io index
add this to your .cargo/config somewhere:

    [source.crates-io]
    registry = 'https://github.com/rust-lang/crates.io-index'
    replace-with = 'local-registry'

    [source.local-registry]
    local-registry = '/local/home/bdonlan/testcargo/local-registry'

and then enable the local registry by copying the above-cited lines into .cargo/config, then cargo check fails:

% cargo check
error: no matching package named `rustc-demangle` found
location searched: registry `https://github.com/rust-lang/crates.io-index`
required by package `testcargo v0.1.0 (/local/home/bdonlan/testcargo)`

Contents of the local registry:

% ls -lR local-registry
local-registry:
total 24
drwxr-xr-x 3 bdonlan bdonlan  4096 May 21 20:41 index
-rw-r--r-- 1 bdonlan bdonlan 18721 May 21 20:41 rustc-demangle-0.1.14.crate

local-registry/index:
total 4
drwxr-xr-x 3 bdonlan bdonlan 4096 May 21 20:41 ru

local-registry/index/ru:
total 4
drwxr-xr-x 2 bdonlan bdonlan 4096 May 21 20:41 st

local-registry/index/ru/st:
total 4
-rw-r--r-- 1 bdonlan bdonlan 456 May 21 20:41 rustc-demangle
% cat local-registry/index/ru/st/rustc-demangle
{"name":"rustc-demangle","vers":"0.1.14","deps":[{"name":"compiler_builtins","req":"^0.1.2","features":[],"optional":true,"default_features":true,"target":null,"kind":null},{"name":"rustc-std-workspace-core","req":"^1.0.0","features":[],"optional":true,"default_features":true,"target":null,"kind":null}],"cksum":"ccc78bfd5acd7bf3e89cffcf899e5cb1a52d6fafa8dec2739ad70c9577a57288","features":{"rustc-dep-of-std":["compiler_builtins","core"]},"yanked":false}

Version information:

% cargo --version
cargo 1.34.0 (6789d8a0a 2019-04-01)

cargo local-registry has no --version, but was just now installed via cargo install cargo-local-registry.

[bdonlan]

This appears to only occur with rustc-demangle 0.1.14; using "rustc-demangle" = "=0.1.13" does not result in the same error.

[sebastianblunt]

Also encountered this issue, debug output:

> RUST_LOG=debug cargo check
[2019-06-08T18:21:08Z DEBUG cargo::core::workspace] find_root - is root /private/tmp/workspace2/Cargo.toml
[2019-06-08T18:21:08Z DEBUG cargo::core::workspace] find_members - /private/tmp/workspace2/foo/Cargo.toml
[2019-06-08T18:21:08Z DEBUG cargo::core::workspace] find_members - /private/tmp/workspace2/Cargo.toml
[2019-06-08T18:21:08Z DEBUG cargo::core::workspace] find_root - trying /private/tmp/workspace2/Cargo.toml
[2019-06-08T18:21:08Z DEBUG cargo::core::workspace] find_root - found a root checking exclusion
[2019-06-08T18:21:08Z DEBUG cargo::core::workspace] find_root - found!
[2019-06-08T18:21:08Z DEBUG cargo::core::workspace] find_root - is root /private/tmp/workspace2/Cargo.toml
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer autocfg v0.1.4
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer backtrace v0.3.30
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer backtrace-sys v0.1.28
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer cc v1.0.37
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer cfg-if v0.1.9
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer failure v0.1.5
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer failure_derive v0.1.5
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer foo v0.1.0 (/private/tmp/workspace2/foo)
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer libc v0.2.58
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer proc-macro2 v0.4.30
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer quote v0.6.12
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer rustc-demangle v0.1.15
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer syn v0.15.35
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer synstructure v0.10.2
[2019-06-08T18:21:08Z DEBUG cargo::ops::resolve] attempting to prefer unicode-xid v0.1.0
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] load/missing  /private/tmp/workspace2/foo
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] loading source /private/tmp/workspace2/foo
[2019-06-08T18:21:08Z DEBUG cargo::sources::config] loading: /private/tmp/workspace2/foo
[2019-06-08T18:21:08Z DEBUG cargo::core::resolver] initial activation: foo v0.1.0 (/private/tmp/workspace2/foo)
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] load/missing  registry `https://github.com/rust-lang/crates.io-index`
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] loading source registry `https://github.com/rust-lang/crates.io-index`
[2019-06-08T18:21:08Z DEBUG cargo::sources::config] loading: registry `https://github.com/rust-lang/crates.io-index`
[2019-06-08T18:21:08Z DEBUG cargo::sources::config] following pointer to local-registry
[2019-06-08T18:21:08Z DEBUG cargo::sources::registry] skipping update due to locked registry
[2019-06-08T18:21:08Z DEBUG cargo::sources::registry] attempting query without update
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] load/match    registry `https://github.com/rust-lang/crates.io-index`
[2019-06-08T18:21:08Z DEBUG cargo::sources::registry] attempting query without update
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] load/match    registry `https://github.com/rust-lang/crates.io-index`
[2019-06-08T18:21:08Z DEBUG cargo::sources::registry] attempting query without update
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] load/match    registry `https://github.com/rust-lang/crates.io-index`
[2019-06-08T18:21:08Z DEBUG cargo::sources::registry] attempting query without update
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] load/match    registry `https://github.com/rust-lang/crates.io-index`
[2019-06-08T18:21:08Z DEBUG cargo::sources::registry] attempting query without update
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] load/match    registry `https://github.com/rust-lang/crates.io-index`
[2019-06-08T18:21:08Z DEBUG cargo::sources::registry] attempting query without update
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] load/match    registry `https://github.com/rust-lang/crates.io-index`
[2019-06-08T18:21:08Z DEBUG cargo::sources::registry] attempting query without update
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] load/match    registry `https://github.com/rust-lang/crates.io-index`
[2019-06-08T18:21:08Z DEBUG cargo::sources::registry] attempting query without update
[2019-06-08T18:21:08Z INFO  cargo::sources::registry::index] failed to parse `rustc-demangle` registry package: Feature `rustc-dep-of-std` includes `core` which is neither a dependency nor another feature
[2019-06-08T18:21:08Z DEBUG cargo::sources::registry] falling back to an update
[2019-06-08T18:21:08Z INFO  cargo::sources::registry::index] failed to parse `rustc-demangle` registry package: Feature `rustc-dep-of-std` includes `core` which is neither a dependency nor another feature
[2019-06-08T18:21:08Z DEBUG cargo::core::resolver] no candidates found
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] load/match    registry `https://github.com/rust-lang/crates.io-index`
[2019-06-08T18:21:08Z DEBUG cargo::sources::registry] attempting query without update
[2019-06-08T18:21:08Z DEBUG cargo::sources::registry] falling back to an update
[2019-06-08T18:21:08Z INFO  cargo::sources::registry::index] failed to parse `rustc-demangle` registry package: Feature `rustc-dep-of-std` includes `core` which is neither a dependency nor another feature
[2019-06-08T18:21:08Z DEBUG cargo::core::registry] load/match    registry `https://github.com/rust-lang/crates.io-index`
[2019-06-08T18:21:08Z DEBUG cargo] exit_with_error; err=CliError { error: Some(ErrorMessage { msg: "no matching package named `rustc-demangle` found\nlocation searched: registry `https://github.com/rust-lang/crates.io-index`\nrequired by package `backtrace v0.3.30`\n    ... which is depended on by `failure v0.1.5`\n    ... which is depended on by `foo v0.1.0 (/private/tmp/workspace2/foo)`" }), unknown: false, exit_code: 101 }
error: no matching package named `rustc-demangle` found
location searched: registry `https://github.com/rust-lang/crates.io-index`
required by package `backtrace v0.3.30`
    ... which is depended on by `failure v0.1.5`
    ... which is depended on by `foo v0.1.0 (/private/tmp/workspace2/foo)`

[FlyingWombat]

same error here

[ChrisGreenaway]

So the key error appears to be:
failed to parse `rustc-demangle` registry package: Feature `rustc-dep-of-std` includes `core` which is neither a dependency nor another feature

[ChrisGreenaway]

The following was added to rustc-demangle from 0.1.13 to 0.1.14:

[dependencies]
core = { version = '1.0.0', optional = true, package = 'rustc-std-workspace-core' }
compiler_builtins = { version = '0.1.2', optional = true }

[features]
rustc-dep-of-std = ['core', 'compiler_builtins']

[ChrisGreenaway]

I think this is closely related to: rust-lang/cargo#5993

[ChrisGreenaway]

So if I generate the local registry, with a project using rustc-demangle version 0.1.15 then I get the following in the registry/index/ru/st/rustc-demangle file:

{"name":"rustc-demangle","vers":"0.1.15","deps":[{"name":"compiler_builtins","req":"^0.1.2","features":[],"optional":true,"default_features":true,"target":null,"kind":null},{"name":"rustc-std-workspace-core","req":"^1.0.0","features":[],"optional":true,"default_features":true,"target":null,"kind":null}],"cksum":"a7f4dccf6f4891ebcc0c39f9b6eb1a83b9bf5d747cb439ec6fba4f3b977038af","features":{"rustc-dep-of-std":["compiler_builtins","core"]},"yanked":false}

Which is different from what crates.io has for that version at https://github.com/rust-lang/crates.io-index/blob/master/ru/st/rustc-demangle:

{"name":"rustc-demangle","vers":"0.1.15","deps":[{"name":"compiler_builtins","req":"^0.1.2","features":[],"optional":true,"default_features":true,"target":null,"kind":"normal"},{"name":"core","req":"^1.0.0","features":[],"optional":true,"default_features":true,"target":null,"kind":"normal","package":"rustc-std-workspace-core"}],"cksum":"a7f4dccf6f4891ebcc0c39f9b6eb1a83b9bf5d747cb439ec6fba4f3b977038af","features":{"rustc-dep-of-std":["core","compiler_builtins"]},"yanked":false,"links":null}