auto merge of #15160 : alexcrichton/rust/remove-f128, r=brson

The f128 type has very little support in the compiler and the feature is
basically unusable today. Supporting half-baked features in the compiler can be
detrimental to the long-term development of the compiler, and hence this feature
is being removed.

4 files changed, 1 insertions, 11 deletions

diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 64d381d2b12..418d18d8d34 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -698,7 +698,6 @@ impl fmt::Show for UintTy {
 pub enum FloatTy {
     TyF32,
     TyF64,
-    TyF128
 }
 
 impl fmt::Show for FloatTy {
diff --git a/src/libsyntax/ast_util.rs b/src/libsyntax/ast_util.rs
index 95bd35764e7..df8cb328270 100644
--- a/src/libsyntax/ast_util.rs
+++ b/src/libsyntax/ast_util.rs
@@ -168,7 +168,6 @@ pub fn float_ty_to_str(t: FloatTy) -> String {
     match t {
         TyF32 => "f32".to_string(),
         TyF64 => "f64".to_string(),
-        TyF128 => "f128".to_string(),
     }
 }
 
diff --git a/src/libsyntax/ext/quote.rs b/src/libsyntax/ext/quote.rs
index 9174bb65b24..35702b1b3cd 100644
--- a/src/libsyntax/ext/quote.rs
+++ b/src/libsyntax/ext/quote.rs
@@ -448,7 +448,6 @@ fn mk_token(cx: &ExtCtxt, sp: Span, tok: &token::Token) -> Gc<ast::Expr> {
             let s_fty = match fty {
                 ast::TyF32 => "TyF32",
                 ast::TyF64 => "TyF64",
-                ast::TyF128 => "TyF128"
             };
             let e_fty = mk_ast_path(cx, sp, s_fty);
             let e_fident = mk_ident(cx, sp, fident);
diff --git a/src/libsyntax/parse/lexer/mod.rs b/src/libsyntax/parse/lexer/mod.rs
index add9a4cb9f3..ac570c88837 100644
--- a/src/libsyntax/parse/lexer/mod.rs
+++ b/src/libsyntax/parse/lexer/mod.rs
@@ -639,16 +639,9 @@ impl<'a> StringReader<'a> {
                 /* FIXME (#2252): if this is out of range for either a
                 32-bit or 64-bit float, it won't be noticed till the
                 back-end.  */
-            } else if c == '1' && n == '2' && self.nextnextch().unwrap_or('\x00') == '8' {
-                self.bump();
-                self.bump();
-                self.bump();
-                let last_bpos = self.last_pos;
-                self.check_float_base(start_bpos, last_bpos, base);
-                return token::LIT_FLOAT(str_to_ident(num_str.as_slice()), ast::TyF128);
             }
             let last_bpos = self.last_pos;
-            self.err_span_(start_bpos, last_bpos, "expected `f32`, `f64` or `f128` suffix");
+            self.err_span_(start_bpos, last_bpos, "expected `f32` or `f64` suffix");
         }
         if is_float {
             let last_bpos = self.last_pos;