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.

1 files changed, 1 insertions, 8 deletions

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;