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+- Start Date: 2014-04-04
+- RFC PR #: (leave this empty)
+- Rust Issue #: (leave this empty)
+
+# Summary
+
+This is an RFC to provide better support for bit fields, including simpler notation and matching.
+
+# Motivation
+
+Bit fields are commonly used in embedded and system software where rust should be an better option compared to C/C++. Working with bit fields is a hard process full of magic numbers and prone to errors.
+
+# Detailed design
+
+The first part of this RFC is defenition of a bit access for integer types. For the sake of simplicity, only fixed width unsigned integer types (u8, u16, u32, u64) are supported.
+
+Bit access operation is defined as
+
+```rust
+let mut val: u32 = ...;
+let bits1 = val[4..5];  // equivalent to bits = (val >> 4) & 3
+let bits2 = val[0,4..5]; // equivalent to bits = ((val >> 4) & 3) | (val & 1)
+
+val[2..7] = 10; // equivalent to val = (val & (0xffffffff ^ 0xfc)) | (10 << 2)
+val[0] = 3; // doesn't compile, as you can't fit 0b11 into one bit place
+```
+
+The second part of this RFC is matching on bits. It is often required to perform different actions based on few bits of an integer. Currently rust requires `_ => ...` in the end for such cases, as one cannot cover all the integer options (while it's possible to cover all the possible bit options). The proposed solution matched with above is:
+
+```rust
+match val[4..5] {
+  0b00 => ...,
+  0b01 => ...,
+  0b10 => ...,
+  0b11 => ...
+} // no match all provided, all variants must be included.
+```
+
+# Alternatives
+
+Provide a bit extraction macros that would perform the first part of this RFC. Doesn't solve the problem of second part.
+
+Erlang has an even better bit matching:
+
+```erlang
+-define(IP_VERSION, 4).
+-define(IP_MIN_HDR_LEN, 5).
+
+DgramSize = byte_size(Dgram),
+case Dgram of 
+    <<?IP_VERSION:4, HLen:4, SrvcType:8, TotLen:16, 
+      ID:16, Flgs:3, FragOff:13,
+      TTL:8, Proto:8, HdrChkSum:16,
+      SrcIP:32,
+      DestIP:32, RestDgram/binary>> when HLen>=5, 4*HLen=<DgramSize ->
+        OptsLen = 4*(HLen - ?IP_MIN_HDR_LEN),
+        <<Opts:OptsLen/binary,Data/binary>> = RestDgram,
+    ...
+end.
+```
+
+# Unresolved questions
+
+TBD