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+- Start Date: 2014-06-25
+- RFC PR #: (leave this empty)
+- Rust Issue #: (leave this empty)
+
+# Summary
+
+Reserve more numeric types.
+
+# Motivation
+
+It is conceivable that Rust will gain support for types such as `f128`, `f16`,
+or `u128`. In the interest of backwards compatability, extend the grammar to
+reserve these.
+
+Adding them is backwards incompatible because `type PRIMITIVE = T;` is an error.
+
+# Detailed design
+
+Reserve the following type names: `fN`, `uN`, `iN` for `N` a multiple of 8.
+
+Reserve additionally `dN` for decimal floating point numbers.
+
+Reserve additionally `mN` for SSE.
+
+# Drawbacks
+
+Makes the grammar larger for types which we may never use.
+
+# Alternatives
+
+New types could require a flag to be enabled.
+
+C99 uses `_Bool` instead of `bool` because `_T` is reserved.