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+- Feature Name: Alternatives in patterns
+- Start Date: 2016-02-14
+- RFC PR: (leave this empty)
+- Rust Issue: (leave this empty)
+
+# Summary
+[summary]: #summary
+Extend the pattern syntax for alternatives in `match` statement, allow alternatives for pattern matching in `let` and `if let` statements.
+
+# Motivation
+[motivation]: #motivation
+
+Rust allows alternatives ( `|` ) in pattern syntax for `match`, but only for 'top-level' of pattern.
+This aims to reduce verbosity in certain examples and increase expressiveness.
+
+Also, this RFC proposes to allow alternatives in `let` or `if let` statements.
+
+# Detailed design
+[design]: #detailed-design
+
+## Expand usage of alternatives to 'deeper levels'
+Imagine a type:
+```rust
+struct NewType (Result<String,String>, u8);
+```
+
+Exhaustive `match` statement for this type would look like this:
+```rust
+match new_type {
+    NewType(Ok(e), num) | NewType(Err(e), num) => println!("ok with {}: {}", num, e)
+}
+```
+
+This RFC proposes a following replacement:
+```rust
+match new_type {
+    NewType(Ok(e) | Err(e), num) => println!("ok with {}: {}", num, e)
+}
+```
+
+
+Little bit more complicated example:
+```rust
+#[derive(Clone, Copy)] enum Test { First, Second }
+//Current Rust:
+match (test1, test2) {
+    (First, First) | (First, Second) | (Second, First) | (Second, Second) => println!("matches")
+}
+//This RFC proposes:
+
+match (test1, test2) {
+    (First| Second, First | Second) => println!("matches")
+}
+```
+
+## Allow alternatives in `let` statements
+Currently expressions like `Ok(e) | Err(e)` are not allowed in `let` or `if let` statements, which brings inconsistence to pattern matching.  
+This RFC proposes following to be allowed:
+```rust
+if let (First | Second) = three_variants_enum {}
+let (Ok(e) | Err(e)) = result;
+let closure = |(Ok(e) | Err(e))| println!(e); // works similar to the statement above
+```
+
+### Parentheses around patterns in `let` statements
+Multiple alternatives should be enclosed in parentheses and represent a single pattern,
+while single alternative should not be enclosed with parens to be backwards compatible.
+```rust
+enum Three{ A(i32), B(i32), C(i32) }
+if let A(i) = three {}
+if let (A(i) | B(i)) = three {}
+```
+Parens should be introduced due to:
+- Pattern matching in closure arguments:
+
+```rust
+let closure = | Ok(i) | Err(i) | i; // Is it possible to find pattern's end and actual closure' start?
+
+let closure = |(Ok(i) | Err(i))| i; // As proposed by this RFC
+```
+- Follow rules for macros (as discussed in [1384#comment](https://github.com/rust-lang/rfcs/pull/1384#issuecomment-164275799))
+
+### Irrefutable patterns
+Patterns in `let` statements must be irrefutable - meaning they must cover every possible variant:
+```rust
+enum Three{ First(u8), Second(u8), Third(u8) }
+//...
+let First(u) | Second(u) = three; //Not allowed!
+```
+
+Patterns in `if let` statements should be disallowed to be irrefutable, it means they are not allowed to cover every possible variant:
+```rust
+if let Ok(e) | Err(e) = result {
+  //Not allowed!
+} else {}
+```
+If pattern is irrefutable, then an `else`-branch will never be executed, and `if` will be redundant.
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+These features, probably, are not easy to implement.
+
+# Alternatives
+[alternatives]: #alternatives
+
+- **This is a subset of [#99](https://github.com/rust-lang/rfcs/pull/99).** The original RFC was postponed and as suggested by [#1456](https://github.com/rust-lang/rfcs/issues/1456#issuecomment-173943563) a new RFC was created with a link to postponed one.
+- **Implement the proposal only for `match`.** This has a downside of further increased inconsistence.
+- **Allow irrefutable patterns in `if let` statements.** This way, `else`-branch will not always execute. If so, a warning about unreachable code should be emitted.
+
+# Unresolved questions
+[unresolved]: #unresolved-questions
+
+- The possibility of treating single variant w/o parens as a pattern (as it is treated today) simultaneously with treating multiple variants with parens as a pattern.
+- The requirement of parens around multiple alternatives in *deeper levels* of pattern matching, i.e is this legal:
+```rust
+match new_type {
+    NewType(Ok(e) | Err(e), num) => println!("ok with {}: {}", num, e)
+}
+```