diff --git a/src/librustc/hir/print.rs b/src/librustc/hir/print.rs
index 0a65473de8ff1..d1020a2d151d4 100644
--- a/src/librustc/hir/print.rs
+++ b/src/librustc/hir/print.rs
@@ -622,7 +622,7 @@ impl<'a> State<'a> {
             }
             hir::ItemKind::GlobalAsm(ref ga) => {
                 self.head(visibility_qualified(&item.vis, "global asm"))?;
-                self.s.word(ga.asm.as_str().get())?;
+                self.s.word(ga.asm.as_str().to_string())?;
                 self.end()?
             }
             hir::ItemKind::Ty(ref ty, ref generics) => {
@@ -1591,7 +1591,7 @@ impl<'a> State<'a> {
         if ident.is_raw_guess() {
             self.s.word(format!("r#{}", ident.name))?;
         } else {
-            self.s.word(ident.as_str().get())?;
+            self.s.word(ident.as_str().to_string())?;
         }
         self.ann.post(self, AnnNode::Name(&ident.name))
     }
@@ -1998,7 +1998,7 @@ impl<'a> State<'a> {
         self.commasep(Inconsistent, &decl.inputs, |s, ty| {
             s.ibox(indent_unit)?;
             if let Some(arg_name) = arg_names.get(i) {
-                s.s.word(arg_name.as_str().get())?;
+                s.s.word(arg_name.as_str().to_string())?;
                 s.s.word(":")?;
                 s.s.space()?;
             } else if let Some(body_id) = body_id {
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index ae8e57d54de31..af069b527b0b4 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -2165,9 +2165,11 @@ impl<'a> Parser<'a> {
                     suffix,
                 ) = self.token {
                     let suffix = suffix.and_then(|s| {
-                        let s = s.as_str().get();
-                        if ["f32", "f64"].contains(&s) {
-                            Some(s)
+                        let s = s.as_str();
+                        if s == "f32" {
+                            Some("f32")
+                        } else if s == "f64" {
+                            Some("f64")
                         } else {
                             None
                         }
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index f5a9aded8455e..ca05ff71c9433 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -645,7 +645,7 @@ pub trait PrintState<'a> {
             ast::LitKind::Float(ref f, t) => {
                 self.writer().word(format!("{}{}", &f, t.ty_to_string()))
             }
-            ast::LitKind::FloatUnsuffixed(ref f) => self.writer().word(f.as_str().get()),
+            ast::LitKind::FloatUnsuffixed(ref f) => self.writer().word(f.as_str().to_string()),
             ast::LitKind::Bool(val) => {
                 if val { self.writer().word("true") } else { self.writer().word("false") }
             }
@@ -731,7 +731,7 @@ pub trait PrintState<'a> {
                 if segment.ident.name == keywords::DollarCrate.name() {
                     self.print_dollar_crate(segment.ident)?;
                 } else {
-                    self.writer().word(segment.ident.as_str().get())?;
+                    self.writer().word(segment.ident.as_str().to_string())?;
                 }
             }
         }
@@ -749,7 +749,7 @@ pub trait PrintState<'a> {
         }
         self.maybe_print_comment(attr.span.lo())?;
         if attr.is_sugared_doc {
-            self.writer().word(attr.value_str().unwrap().as_str().get())?;
+            self.writer().word(attr.value_str().unwrap().as_str().to_string())?;
             self.writer().hardbreak()
         } else {
             match attr.style {
@@ -858,7 +858,7 @@ pub trait PrintState<'a> {
         if !ast::Ident::with_empty_ctxt(name).is_path_segment_keyword() {
             self.writer().word("::")?;
         }
-        self.writer().word(name.as_str().get())
+        self.writer().word(name.as_str().to_string())
     }
 }
 
@@ -1300,7 +1300,7 @@ impl<'a> State<'a> {
             }
             ast::ItemKind::GlobalAsm(ref ga) => {
                 self.head(visibility_qualified(&item.vis, "global_asm!"))?;
-                self.s.word(ga.asm.as_str().get())?;
+                self.s.word(ga.asm.as_str().to_string())?;
                 self.end()?;
             }
             ast::ItemKind::Ty(ref ty, ref generics) => {
@@ -2437,7 +2437,7 @@ impl<'a> State<'a> {
         if ident.is_raw_guess() {
             self.s.word(format!("r#{}", ident))?;
         } else {
-            self.s.word(ident.as_str().get())?;
+            self.s.word(ident.as_str().to_string())?;
         }
         self.ann.post(self, AnnNode::Ident(&ident))
     }
@@ -2447,7 +2447,7 @@ impl<'a> State<'a> {
     }
 
     pub fn print_name(&mut self, name: ast::Name) -> io::Result<()> {
-        self.s.word(name.as_str().get())?;
+        self.s.word(name.as_str().to_string())?;
         self.ann.post(self, AnnNode::Name(&name))
     }
 
diff --git a/src/libsyntax_ext/proc_macro_server.rs b/src/libsyntax_ext/proc_macro_server.rs
index f902e8169b6ba..09dce77579001 100644
--- a/src/libsyntax_ext/proc_macro_server.rs
+++ b/src/libsyntax_ext/proc_macro_server.rs
@@ -336,11 +336,11 @@ impl Ident {
         }
     }
     fn new(sym: Symbol, is_raw: bool, span: Span) -> Ident {
-        let string = sym.as_str().get();
-        if !Self::is_valid(string) {
+        let string = sym.as_str();
+        if !Self::is_valid(&string) {
             panic!("`{:?}` is not a valid identifier", string)
         }
-        if is_raw && !ast::Ident::from_str(string).can_be_raw() {
+        if is_raw && !ast::Ident::from_interned_str(sym.as_interned_str()).can_be_raw() {
             panic!("`{}` cannot be a raw identifier", string);
         }
         Ident { sym, is_raw, span }
diff --git a/src/libsyntax_pos/symbol.rs b/src/libsyntax_pos/symbol.rs
index f61aa4284d29b..393f52e7de517 100644
--- a/src/libsyntax_pos/symbol.rs
+++ b/src/libsyntax_pos/symbol.rs
@@ -524,7 +524,11 @@ impl LocalInternedString {
         }
     }
 
-    pub fn get(&self) -> &'static str {
+    pub fn get(&self) -> &str {
+        // This returns a valid string since we ensure that `self` outlives the interner
+        // by creating the interner on a thread which outlives threads which can access it.
+        // This type cannot move to a thread which outlives the interner since it does
+        // not implement Send.
         self.string
     }
 }