extract rustc-std-workspace crate sources from crates.io and place them here

Author: RalfJung

src/tools/rustc-std-workspace/README.md

@@ -0,0 +1,4 @@
+See `library/rustc-std-workspace-core/README.md` for context.
+
+These are the crates.io versions of these crates, as opposed to the versions
+in `library` which are the ones used inside the rustc workspace.

src/tools/rustc-std-workspace/rustc-std-workspace-alloc/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "rustc-std-workspace-alloc"
+version = "1.0.0"
+authors = ["Alex Crichton <[email protected]>"]
+edition = "2018"
+license = 'MIT/Apache-2.0'
+description = 'workspace hack'
+
+[dependencies]

src/tools/rustc-std-workspace/rustc-std-workspace-alloc/src/lib.rs

@@ -0,0 +1,10 @@
+[package]
+name = "rustc-std-workspace-core"
+version = "1.0.0"
+authors = ["Alex Crichton <[email protected]>"]
+license = "MIT/Apache-2.0"
+description = """
+Explicitly empty crate for rust-lang/rust integration
+"""
+
+[dependencies]

src/tools/rustc-std-workspace/rustc-std-workspace-core/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "rustc-std-workspace-std"
+version = "1.0.1"
+authors = ["Alex Crichton <[email protected]>"]
+license = "MIT/Apache-2.0"
+description = "Workaround for rustbuild"
+
+[lib]
+name = "std"
+

src/tools/rustc-std-workspace/rustc-std-workspace-core/src/lib.rs

@@ -0,0 +1 @@
+pub use std::*;