rollup merge of #27678: alexcrichton/snapshots

* Lots of core prelude imports removed
* Makefile support for MSVC env vars and Rust crates removed
* Makefile support for morestack removed

3 files changed, 0 insertions, 9 deletions

diff --git a/src/libstd/io/cursor.rs b/src/libstd/io/cursor.rs
index 8033d77ff6a..9590f0b7aa7 100644
--- a/src/libstd/io/cursor.rs
+++ b/src/libstd/io/cursor.rs
@@ -292,9 +292,6 @@ impl Write for Cursor<Vec<u8>> {
 
 #[cfg(test)]
 mod tests {
-    #[cfg(stage0)]
-    use core::prelude::v1::*;
-
     use io::prelude::*;
     use io::{Cursor, SeekFrom};
     use vec::Vec;
diff --git a/src/libstd/io/impls.rs b/src/libstd/io/impls.rs
index 864870a5905..a5c8ba335c1 100644
--- a/src/libstd/io/impls.rs
+++ b/src/libstd/io/impls.rs
@@ -8,9 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#[cfg(stage0)]
-use core::prelude::v1::*;
-
 use boxed::Box;
 use cmp;
 use io::{self, SeekFrom, Read, Write, Seek, BufRead, Error, ErrorKind};
diff --git a/src/libstd/io/util.rs b/src/libstd/io/util.rs
index 6e218f6ca7e..07a9548224a 100644
--- a/src/libstd/io/util.rs
+++ b/src/libstd/io/util.rs
@@ -10,9 +10,6 @@
 
 #![allow(missing_copy_implementations)]
 
-#[cfg(stage0)]
-use prelude::v1::*;
-
 use io::{self, Read, Write, ErrorKind, BufRead};
 
 /// Copies the entire contents of a reader into a writer.