cargo build rails on rust nightly 1.13.0 (`type macros are experimental`)

[philippkeller]

my config: rustup show yields

Default host: x86_64-apple-darwin

installed toolchains
--------------------

stable-x86_64-apple-darwin
nightly-x86_64-apple-darwin (default)

active toolchain
----------------

nightly-x86_64-apple-darwin (default)
rustc 1.13.0-nightly (ef9786ce0 2016-09-02)

I get the following error: type macros are experimental, full error message:

> cargo build
   Compiling rustc-serialize v0.3.19
   Compiling unicode-normalization v0.1.2
   Compiling nom v1.2.4
   Compiling quine-mc_cluskey v0.2.4
   Compiling semver v0.2.3
   Compiling regex-syntax v0.3.4
   Compiling matches v0.1.2
   Compiling toml v0.1.30
   Compiling clippy_lints v0.0.87 (file:///private/var/tmp/rust-clippy-0.0.87/clippy_lints)
clippy_lints/src/utils/conf.rs:91:27: 91:63 error: type macros are experimental (see issue #27245)
clippy_lints/src/utils/conf.rs:91             $(#[$doc] pub $rust_name: define_Conf!(TY $($ty)+),)+
                                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
clippy_lints/src/utils/conf.rs:163:1: 180:2 note: in this expansion of define_Conf! (defined in clippy_lints/src/utils/conf.rs)
clippy_lints/src/utils/conf.rs:91:27: 91:63 help: add #![feature(type_macros)] to the crate attributes to enable
clippy_lints/src/utils/conf.rs:91:27: 91:63 error: type macros are experimental (see issue #27245)
clippy_lints/src/utils/conf.rs:91             $(#[$doc] pub $rust_name: define_Conf!(TY $($ty)+),)+
                                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
clippy_lints/src/utils/conf.rs:163:1: 180:2 note: in this expansion of define_Conf! (defined in clippy_lints/src/utils/conf.rs)
clippy_lints/src/utils/conf.rs:91:27: 91:63 help: add #![feature(type_macros)] to the crate attributes to enable
clippy_lints/src/utils/conf.rs:91:27: 91:63 error: type macros are experimental (see issue #27245)
clippy_lints/src/utils/conf.rs:91             $(#[$doc] pub $rust_name: define_Conf!(TY $($ty)+),)+
                                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
clippy_lints/src/utils/conf.rs:163:1: 180:2 note: in this expansion of define_Conf! (defined in clippy_lints/src/utils/conf.rs)
clippy_lints/src/utils/conf.rs:91:27: 91:63 help: add #![feature(type_macros)] to the crate attributes to enable
clippy_lints/src/utils/conf.rs:91:27: 91:63 error: type macros are experimental (see issue #27245)
clippy_lints/src/utils/conf.rs:91             $(#[$doc] pub $rust_name: define_Conf!(TY $($ty)+),)+
                                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
clippy_lints/src/utils/conf.rs:163:1: 180:2 note: in this expansion of define_Conf! (defined in clippy_lints/src/utils/conf.rs)
clippy_lints/src/utils/conf.rs:91:27: 91:63 help: add #![feature(type_macros)] to the crate attributes to enable
clippy_lints/src/utils/conf.rs:91:27: 91:63 error: type macros are experimental (see issue #27245)
clippy_lints/src/utils/conf.rs:91             $(#[$doc] pub $rust_name: define_Conf!(TY $($ty)+),)+
                                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
clippy_lints/src/utils/conf.rs:163:1: 180:2 note: in this expansion of define_Conf! (defined in clippy_lints/src/utils/conf.rs)
clippy_lints/src/utils/conf.rs:91:27: 91:63 help: add #![feature(type_macros)] to the crate attributes to enable
clippy_lints/src/utils/conf.rs:91:27: 91:63 error: type macros are experimental (see issue #27245)
clippy_lints/src/utils/conf.rs:91             $(#[$doc] pub $rust_name: define_Conf!(TY $($ty)+),)+
                                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
clippy_lints/src/utils/conf.rs:163:1: 180:2 note: in this expansion of define_Conf! (defined in clippy_lints/src/utils/conf.rs)
clippy_lints/src/utils/conf.rs:91:27: 91:63 help: add #![feature(type_macros)] to the crate attributes to enable
clippy_lints/src/utils/conf.rs:91:27: 91:63 error: type macros are experimental (see issue #27245)
clippy_lints/src/utils/conf.rs:91             $(#[$doc] pub $rust_name: define_Conf!(TY $($ty)+),)+
                                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
clippy_lints/src/utils/conf.rs:163:1: 180:2 note: in this expansion of define_Conf! (defined in clippy_lints/src/utils/conf.rs)
clippy_lints/src/utils/conf.rs:91:27: 91:63 help: add #![feature(type_macros)] to the crate attributes to enable
clippy_lints/src/utils/conf.rs:91:27: 91:63 error: type macros are experimental (see issue #27245)
clippy_lints/src/utils/conf.rs:91             $(#[$doc] pub $rust_name: define_Conf!(TY $($ty)+),)+
                                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
clippy_lints/src/utils/conf.rs:163:1: 180:2 note: in this expansion of define_Conf! (defined in clippy_lints/src/utils/conf.rs)
clippy_lints/src/utils/conf.rs:91:27: 91:63 help: add #![feature(type_macros)] to the crate attributes to enable
error: aborting due to 8 previous errors
error: Could not compile `clippy_lints`.

any hints?

[mcarton]

type_macros has been stabilized a few days ago, which gave a new warning about the unused attribute in Clippy, so I removed it.
Clippy master and v0.0.87 compile fine for me and for Travis on ef9786ce0 2016-09-02.

It looks like you have two nightly toolchains installed. nightly-x86_64-apple-darwin being the default, and rustc 1.13.0-nightly (ef9786ce0 2016-09-02). Is ``nightly-x86_64-apple-darwin` up-to-date?

[philippkeller]

right, somehow the default was set to nightly-x86_64-apple-darwin. I've managed to set it to yesterdays nightly:

rustup show
Default host: x86_64-apple-darwin

installed toolchains
--------------------

stable-x86_64-apple-darwin
nightly-2016-09-03-x86_64-apple-darwin (default)
nightly-x86_64-apple-darwin

active toolchain
----------------

nightly-2016-09-03-x86_64-apple-darwin (default)
rustc 1.13.0-nightly (ef9786ce0 2016-09-02)

but still the error remains..

[philippkeller]

after running rustc --version printed rustc 1.12.0-nightly (5e18b4bad 2016-07-08) it was clear that I somehow had two competing rust installations. So I ran rustup self uninstall and sudo /usr/local/lib/rustlib/uninstall.sh to uninstall and curl https://sh.rustup.rs -sSf | sh and rustup default nightly to reinstall / switch to nightly. Now it compiles. Sorry for the trouble.