for consistency symlink_tree failure = os.Exit(1)

 Brings down time taken to fail from 18s to 13s (on aosp branch)

Test: temporarily coded random failure
Bug: N/A
Change-Id: Ib694eec977293f4dd7054e779d1b82b8cace93f6
diff --git a/bp2build/symlink_forest.go b/bp2build/symlink_forest.go
index 4a4ae9e..667b952 100644
--- a/bp2build/symlink_forest.go
+++ b/bp2build/symlink_forest.go
@@ -50,7 +50,6 @@
 	depCh        chan string
 	mkdirCount   atomic.Uint64
 	symlinkCount atomic.Uint64
-	okay         atomic.Bool // Whether the forest was successfully constructed
 }
 
 // A simple thread pool to limit concurrency on system calls.
@@ -366,14 +365,14 @@
 			if err != nil {
 				fmt.Fprintf(os.Stderr, "Error merging %s and %s: %s",
 					srcBuildFile, generatedBuildFile, err)
-				context.okay.Store(false)
+				os.Exit(1)
 			}
 		} else {
 			// Both exist and one is a file. This is an error.
 			fmt.Fprintf(os.Stderr,
 				"Conflict in workspace symlink tree creation: both '%s' and '%s' exist and exactly one is a directory\n",
 				srcChild, buildFilesChild)
-			context.okay.Store(false)
+			os.Exit(1)
 		}
 	}
 }
@@ -436,8 +435,6 @@
 		symlinkCount: atomic.Uint64{},
 	}
 
-	context.okay.Store(true)
-
 	removeParallel(shared.JoinPath(topdir, forest))
 
 	instructions := instructionsFromExcludePathList(exclude)
@@ -452,9 +449,5 @@
 		deps = append(deps, dep)
 	}
 
-	if !context.okay.Load() {
-		os.Exit(1)
-	}
-
 	return deps, context.mkdirCount.Load(), context.symlinkCount.Load()
 }
diff --git a/tests/bootstrap_test.sh b/tests/bootstrap_test.sh
index 17b4419..f3bad73 100755
--- a/tests/bootstrap_test.sh
+++ b/tests/bootstrap_test.sh
@@ -75,7 +75,6 @@
   grep -q "^# Module:.*my_great_binary_host" out/soong/build.ninja || fail "new module not found"
 }
 
-
 function test_add_android_bp() {
   setup
   run_soong
@@ -313,7 +312,6 @@
 
 }
 
-
 function test_add_file_to_soong_build() {
   setup
   run_soong
@@ -736,7 +734,6 @@
 
 }
 
-
 function test_bp2build_bazel_workspace_structure {
   setup
 
@@ -802,7 +799,7 @@
     || fail "${GENERATED_BUILD_FILE_NAME} files symlinked to the wrong place"
 }
 
-function test_bp2build_reports_multiple_errors {
+function test_bp2build_fails_fast {
   setup
 
   mkdir -p "a/${GENERATED_BUILD_FILE_NAME}"
@@ -830,7 +827,7 @@
   fi
 
   grep -q "a/${GENERATED_BUILD_FILE_NAME}' exist" "$MOCK_TOP/errors" || fail "Error for a/${GENERATED_BUILD_FILE_NAME} not found"
-  grep -q "b/${GENERATED_BUILD_FILE_NAME}' exist" "$MOCK_TOP/errors" || fail "Error for b/${GENERATED_BUILD_FILE_NAME} not found"
+  grep -q -v "b/${GENERATED_BUILD_FILE_NAME}' exist" "$MOCK_TOP/errors" || fail "Error for b/${GENERATED_BUILD_FILE_NAME} found but not expected"
 }
 
 function test_bp2build_back_and_forth_null_build {