Merge pull request #1136 from scuellar/update_doc_folder_change

Just update docs to reflect new location of rust source.

Author: kngwyu

README.md

@@ -47,7 +47,7 @@ As mentioned in the command output, don't forget to add the installation directo
 
 1. Fetch the Rust sourcecode
 
-    1. automatically via [rustup](https://www.rustup.rs/) and run `rustup component add rust-src` in order to install the source to `$(rustc --print sysroot)/lib/rustlib/src/rust/src`. Rustup will keep the sources in sync with the toolchain if you run `rustup update`.
+    1. automatically via [rustup](https://www.rustup.rs/) and run `rustup component add rust-src` in order to install the source to `$(rustc --print sysroot)/lib/rustlib/src/rust/library` (or `$(rustc --print sysroot)/lib/rustlib/src/rust/src` in older toolchains). Rustup will keep the sources in sync with the toolchain if you run `rustup update`.
 
     2. manually from git: https://github.com/rust-lang/rust
 

src/racer/util.rs

@@ -419,23 +419,23 @@ impl fmt::Display for RustSrcPathError {
                 f,
                 "RUST_SRC_PATH environment variable must be set to \
                  point to the src directory of a rust checkout. \
-                 E.g. \"/home/foouser/src/rust/src\""
+                 E.g. \"/home/foouser/src/rust/library\"  (or  \"/home/foouser/src/rust/src\" in older toolchains)"
             ),
             RustSrcPathError::DoesNotExist(ref path) => write!(
                 f,
                 "racer can't find the directory pointed to by the \
                  RUST_SRC_PATH variable \"{:?}\". Try using an \
                  absolute fully qualified path and make sure it \
                  points to the src directory of a rust checkout - \
-                 e.g. \"/home/foouser/src/rust/src\".",
+                 e.g. \"/home/foouser/src/rust/library\" (or  \"/home/foouser/src/rust/src\" in older toolchains).",
                 path
             ),
             RustSrcPathError::NotRustSourceTree(ref path) => write!(
                 f,
                 "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\". \
+                 \"/home/foouser/src/rust/library\" (or  \"/home/foouser/src/rust/src\" in older toolchains). \
                  Current value \"{:?}\"",
                 path
             ),