Fix test case header parsing code in presence of multiple revisions.

The previous code would parse the TestProps, and then parse them
again with a revision set, adding some elements (like aux_builds)
a second time to the existing TestProps.

Author: michaelwoerister

src/tools/compiletest/src/header.rs

@@ -259,20 +259,20 @@ impl TestProps {
         props
     }
 
-    pub fn from_file(testfile: &Path, config: &Config) -> Self {
+    pub fn from_file(testfile: &Path, cfg: Option<&str>, config: &Config) -> Self {
         let mut props = TestProps::new();
-        props.load_from(testfile, None, config);
+        props.load_from(testfile, cfg, config);
         props
     }
 
     /// Load properties from `testfile` into `props`. If a property is
     /// tied to a particular revision `foo` (indicated by writing
     /// `//[foo]`), then the property is ignored unless `cfg` is
     /// `Some("foo")`.
-    pub fn load_from(&mut self,
-                     testfile: &Path,
-                     cfg: Option<&str>,
-                     config: &Config) {
+    fn load_from(&mut self,
+                 testfile: &Path,
+                 cfg: Option<&str>,
+                 config: &Config) {
         iter_header(testfile,
                     cfg,
                     &mut |ln| {

src/tools/compiletest/src/runtest.rs

@@ -69,7 +69,7 @@ pub fn run(config: Config, testpaths: &TestPaths) {
         print!("\n\n");
     }
     debug!("running {:?}", testpaths.file.display());
-    let base_props = TestProps::from_file(&testpaths.file, &config);
+    let base_props = TestProps::from_file(&testpaths.file, None, &config);
 
     let base_cx = TestCx { config: &config,
                            props: &base_props,
@@ -81,8 +81,9 @@ pub fn run(config: Config, testpaths: &TestPaths) {
         base_cx.run_revision()
     } else {
         for revision in &base_props.revisions {
-            let mut revision_props = base_props.clone();
-            revision_props.load_from(&testpaths.file, Some(revision), &config);
+            let revision_props = TestProps::from_file(&testpaths.file,
+                                                      Some(revision),
+                                                      &config);
             let rev_cx = TestCx {
                 config: &config,
                 props: &revision_props,
@@ -2614,4 +2615,4 @@ fn read2_abbreviated(mut child: Child) -> io::Result<Output> {
         stdout: stdout.into_bytes(),
         stderr: stderr.into_bytes(),
     })
-}
+}