Implement opt-out from UI testing normalization

Author: petrochenkov

src/test/ui/ui-testing-optout.rs

@@ -0,0 +1,104 @@
+// disable-ui-testing-normalization
+
+// Line number < 10
+type A = B; //~ ERROR
+
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Line number >=10, <100
+type C = D; //~ ERROR
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+// Line num >=100
+type E = F; //~ ERROR
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+fn main() {}

src/test/ui/ui-testing-optout.stderr

@@ -0,0 +1,20 @@
+error[E0412]: cannot find type `B` in this scope
+ --> $DIR/ui-testing-optout.rs:4:10
+  |
+4 | type A = B; //~ ERROR
+  |          ^ did you mean `A`?
+
+error[E0412]: cannot find type `D` in this scope
+  --> $DIR/ui-testing-optout.rs:17:10
+   |
+17 | type C = D; //~ ERROR
+   |          ^ did you mean `A`?
+
+error[E0412]: cannot find type `F` in this scope
+   --> $DIR/ui-testing-optout.rs:102:10
+    |
+102 | type E = F; //~ ERROR
+    |          ^ did you mean `A`?
+
+error: aborting due to 3 previous errors
+

src/tools/compiletest/src/header.rs

@@ -226,9 +226,10 @@ pub struct TestProps {
     pub must_compile_successfully: bool,
     // rustdoc will test the output of the `--test` option
     pub check_test_line_numbers_match: bool,
-    // The test must be compiled and run successfully. Only used in UI tests for
-    // now.
+    // The test must be compiled and run successfully. Only used in UI tests for now.
     pub run_pass: bool,
+    // Do not pass `-Z ui-testing` to UI tests
+    pub disable_ui_testing_normalization: bool,
     // customized normalization rules
     pub normalize_stdout: Vec<(String, String)>,
     pub normalize_stderr: Vec<(String, String)>,
@@ -259,6 +260,7 @@ impl TestProps {
             must_compile_successfully: false,
             check_test_line_numbers_match: false,
             run_pass: false,
+            disable_ui_testing_normalization: false,
             normalize_stdout: vec![],
             normalize_stderr: vec![],
             failure_status: 101,
@@ -379,6 +381,11 @@ impl TestProps {
                     config.parse_must_compile_successfully(ln) || self.run_pass;
             }
 
+            if !self.disable_ui_testing_normalization {
+                self.disable_ui_testing_normalization =
+                    config.parse_disable_ui_testing_normalization(ln);
+            }
+
             if let Some(rule) = config.parse_custom_normalization(ln, "normalize-stdout") {
                 self.normalize_stdout.push(rule);
             }
@@ -505,6 +512,10 @@ impl Config {
         self.parse_name_directive(line, "must-compile-successfully")
     }
 
+    fn parse_disable_ui_testing_normalization(&self, line: &str) -> bool {
+        self.parse_name_directive(line, "disable-ui-testing-normalization")
+    }
+
     fn parse_check_test_line_numbers_match(&self, line: &str) -> bool {
         self.parse_name_directive(line, "check-test-line-numbers-match")
     }

src/tools/compiletest/src/runtest.rs

@@ -1632,7 +1632,9 @@ impl<'test> TestCx<'test> {
                 // a first time to get the compiler's output then compile with
                 // "--error-format json" to check if all expected errors are actually there
                 // and that no new one appeared.
-                rustc.arg("-Zui-testing");
+                if !self.props.disable_ui_testing_normalization {
+                    rustc.arg("-Zui-testing");
+                }
             }
             MirOpt => {
                 rustc.args(&[