diff --git a/src/tools/compiletest/src/header.rs b/src/tools/compiletest/src/header.rs
index 8b3023e63dfb4..4e25e3a77110a 100644
--- a/src/tools/compiletest/src/header.rs
+++ b/src/tools/compiletest/src/header.rs
@@ -205,7 +205,7 @@ impl EarlyProps {
         fn ignore_lldb(config: &Config, line: &str) -> bool {
             if let Some(ref actual_version) = config.lldb_version {
                 if line.starts_with("min-lldb-version") {
-                    let min_version = line.trim_right()
+                    let min_version = line.trim_end()
                         .rsplit(' ')
                         .next()
                         .expect("Malformed lldb version directive");
@@ -228,7 +228,7 @@ impl EarlyProps {
             }
             if let Some(ref actual_version) = config.llvm_version {
                 if line.starts_with("min-llvm-version") {
-                    let min_version = line.trim_right()
+                    let min_version = line.trim_end()
                         .rsplit(' ')
                         .next()
                         .expect("Malformed llvm version directive");
@@ -236,7 +236,7 @@ impl EarlyProps {
                     // version
                     &actual_version[..] < min_version
                 } else if line.starts_with("min-system-llvm-version") {
-                    let min_version = line.trim_right()
+                    let min_version = line.trim_end()
                         .rsplit(' ')
                         .next()
                         .expect("Malformed llvm version directive");
@@ -573,14 +573,14 @@ fn iter_header(testfile: &Path, cfg: Option<&str>, it: &mut dyn FnMut(&str)) {
                     None => false,
                 };
                 if matches {
-                    it(ln[(close_brace + 1)..].trim_left());
+                    it(ln[(close_brace + 1)..].trim_start());
                 }
             } else {
                 panic!("malformed condition directive: expected `{}foo]`, found `{}`",
                         comment_with_brace, ln)
             }
         } else if ln.starts_with(comment) {
-            it(ln[comment.len() ..].trim_left());
+            it(ln[comment.len() ..].trim_start());
         }
     }
     return;
diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index 0e9b5b11366fb..0b3fc5a192451 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -1082,7 +1082,7 @@ impl<'test> TestCx<'test> {
             match line {
                 Ok(line) => {
                     let line = if line.starts_with("//") {
-                        line[2..].trim_left()
+                        line[2..].trim_start()
                     } else {
                         line.as_str()
                     };
@@ -2146,8 +2146,8 @@ impl<'test> TestCx<'test> {
             .lines()
             .enumerate()
             .filter_map(|(line_nb, line)| {
-                if (line.trim_left().starts_with("pub mod ")
-                    || line.trim_left().starts_with("mod "))
+                if (line.trim_start().starts_with("pub mod ")
+                    || line.trim_start().starts_with("mod "))
                     && line.ends_with(';')
                 {
                     if let Some(ref mut other_files) = other_files {
@@ -2156,7 +2156,7 @@ impl<'test> TestCx<'test> {
                     None
                 } else {
                     let sline = line.split("///").last().unwrap_or("");
-                    let line = sline.trim_left();
+                    let line = sline.trim_start();
                     if line.starts_with("```") {
                         if ignore {
                             ignore = false;
@@ -3287,7 +3287,7 @@ fn normalize_mir_line(line: &str) -> String {
 fn nocomment_mir_line(line: &str) -> &str {
     if let Some(idx) = line.find("//") {
         let (l, _) = line.split_at(idx);
-        l.trim_right()
+        l.trim_end()
     } else {
         line
     }