racer failed on nightly rustc 1.47.0-nightly (8e21bd063 2020-08-14)

[gotope]

macOS, emacs26.3, nightly-x86_64-apple-darwin unchanged - rustc 1.47.0-nightly (8e21bd063 2020-08-14)

$ls $RUST_SRC_PATH/..
Cargo.lock library
$ echo $RUST_SRC_PATH
/Users/pok/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/src/rust/library
$ls $RUST_SRC_PATH/
alloc panic_unwind rustc-std-workspace-alloc stdarch
backtrace proc_macro rustc-std-workspace-core term
core profiler_builtins rustc-std-workspace-std test
panic_abort rtstartup std unwind

error info
Unable to find libstd under RUST_SRC_PATH. N.B. RUST_SRC_PATH variable needs to point to the src directory inside a rust checkout e.g. "/home/foouser/src/rust/src". Current value ""/Users/pok/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/src/rust/library/libstd""

[jonas-hagen]

Same problem here. This is caused by recent changes in rust source paths and racer not yet being aware of it: racer-rust/racer#1125

[demont93]

Changing rust-src-path from
"$(rustc --print sysroot)/lib/rustlib/src/rust/src"
to
"$(rustc --print sysroot)/lib/rustlib/src/rust/library"
fixed it for me.