From f9ff78318f83281993c9d66a4b0cf4d72c883633 Mon Sep 17 00:00:00 2001
From: UebelAndre <github@uebelandre.com>
Date: Fri, 14 Jan 2022 07:09:07 -0800
Subject: [PATCH] Revert "optimization: switch fastbuild opt default to 1 from
 0 (#1091)" (#1094)

This reverts commit 2048a655aa18386430fcf0fa382dc9b6b6f80617.
---
 docs/flatten.md           | 2 +-
 docs/rust_repositories.md | 2 +-
 rust/toolchain.bzl        | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/docs/flatten.md b/docs/flatten.md
index bcda7d736c..9a1a968b79 100644
--- a/docs/flatten.md
+++ b/docs/flatten.md
@@ -1167,7 +1167,7 @@ See @rules_rust//rust:repositories.bzl for examples of defining the @rust_cpuX r
 | <a id="rust_toolchain-default_edition"></a>default_edition |  The edition to use for rust_* rules that don't specify an edition.   | String | optional | "2018" |
 | <a id="rust_toolchain-dylib_ext"></a>dylib_ext |  The extension for dynamic libraries created from rustc.   | String | required |  |
 | <a id="rust_toolchain-exec_triple"></a>exec_triple |  The platform triple for the toolchains execution environment. For more details see: https://docs.bazel.build/versions/master/skylark/rules.html#configurations   | String | optional | "" |
-| <a id="rust_toolchain-opt_level"></a>opt_level |  Rustc optimization levels.   | <a href="https://bazel.build/docs/skylark/lib/dict.html">Dictionary: String -> String</a> | optional | {"dbg": "0", "fastbuild": "1", "opt": "3"} |
+| <a id="rust_toolchain-opt_level"></a>opt_level |  Rustc optimization levels.   | <a href="https://bazel.build/docs/skylark/lib/dict.html">Dictionary: String -> String</a> | optional | {"dbg": "0", "fastbuild": "0", "opt": "3"} |
 | <a id="rust_toolchain-os"></a>os |  The operating system for the current toolchain   | String | required |  |
 | <a id="rust_toolchain-rust_doc"></a>rust_doc |  The location of the <code>rustdoc</code> binary. Can be a direct source or a filegroup containing one item.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-rust_lib"></a>rust_lib |  The rust standard library.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
diff --git a/docs/rust_repositories.md b/docs/rust_repositories.md
index de9cadd845..48ca2b0ecd 100644
--- a/docs/rust_repositories.md
+++ b/docs/rust_repositories.md
@@ -93,7 +93,7 @@ See @rules_rust//rust:repositories.bzl for examples of defining the @rust_cpuX r
 | <a id="rust_toolchain-default_edition"></a>default_edition |  The edition to use for rust_* rules that don't specify an edition.   | String | optional | "2018" |
 | <a id="rust_toolchain-dylib_ext"></a>dylib_ext |  The extension for dynamic libraries created from rustc.   | String | required |  |
 | <a id="rust_toolchain-exec_triple"></a>exec_triple |  The platform triple for the toolchains execution environment. For more details see: https://docs.bazel.build/versions/master/skylark/rules.html#configurations   | String | optional | "" |
-| <a id="rust_toolchain-opt_level"></a>opt_level |  Rustc optimization levels.   | <a href="https://bazel.build/docs/skylark/lib/dict.html">Dictionary: String -> String</a> | optional | {"dbg": "0", "fastbuild": "1", "opt": "3"} |
+| <a id="rust_toolchain-opt_level"></a>opt_level |  Rustc optimization levels.   | <a href="https://bazel.build/docs/skylark/lib/dict.html">Dictionary: String -> String</a> | optional | {"dbg": "0", "fastbuild": "0", "opt": "3"} |
 | <a id="rust_toolchain-os"></a>os |  The operating system for the current toolchain   | String | required |  |
 | <a id="rust_toolchain-rust_doc"></a>rust_doc |  The location of the <code>rustdoc</code> binary. Can be a direct source or a filegroup containing one item.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-rust_lib"></a>rust_lib |  The rust standard library.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
diff --git a/rust/toolchain.bzl b/rust/toolchain.bzl
index b9b02cf639..834382ecf3 100644
--- a/rust/toolchain.bzl
+++ b/rust/toolchain.bzl
@@ -342,7 +342,7 @@ rust_toolchain = rule(
             doc = "Rustc optimization levels.",
             default = {
                 "dbg": "0",
-                "fastbuild": "1",
+                "fastbuild": "0",
                 "opt": "3",
             },
         ),