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+- Feature Name: overlapping_match_statements
+- Start Date: 2017-09-08
+- RFC PR: (leave this empty)
+- Rust Issue: (leave this empty)
+
+# Summary
+[summary]: #summary
+
+This idea facilitates the writing and using of `match` expressions where multiple branches are
+executed. Writing `match` expressions with this idea allows for multiple branches to be matched
+and for a check on no matches as well, similar to the current use of the `_` pattern.
+
+# Motivation
+[motivation]: #motivation
+
+There is a very good software engineering principle where repeating a piece of code is bad.
+This is the case because if that selection of code needs to be changed then it has to be
+changed in two places which can easily not be done and thus create bugs. A way of doing this
+for a large selection of lines of code is to put it into a function, a helper function. Allowing
+overlapping match statements extends this paradigm to that where matching is a good idea, the
+use of pattern matching, and where exhaustiveness checks are a nice thing.
+
+This would support use cases where the required execution of several branches overlapped enough
+that his would help. A use case for this is when the outcome of one branch is the same as a
+combination of the other two branches of a match statement. The expected outcome of this is
+the ability to have multiple branches of a match statement, and having those branches still be
+checked for exhaustiveness, be executed if more than one of them match the value.
+
+# Detailed design
+[design]: #detailed-design
+
+Basic Syntax:
+```rust
+match many val {
+    pat | pat => expr,
+    pat => expr
+}
+
+match many val {
+    pat | pat => expr,
+    pat => expr
+} else {
+    expr
+}
+```
+
+Benefits of this syntax:
+1. Even though a new keyword has been made it will not break any code because Rust is a context
+sensitive language. And adding such a keyword increases the perceptual area of the new syntax
+so as to make it clear which type of match is being used.
+2. The word `many` is used because it implies that after a branch is finished then the
+control falls through to the check of the next branch.
+
+Meaning of parts:
+1. The `else` is used in a similar sort of vein to that of the `_` pattern in normal matches.
+The expression enclosed within this is only executed if none of the patterns within the
+`match/many` expression are matched. If `else` and `_` are both present then the code within the
+`else` would be marked as unreadable.
+
+Edge cases:
+1. If the `_` pattern in present in any of the contained matches and the `else` block is also
+present then a `unreachable_code` lint is emitted on the code within the `else` block
+2. Since the main reason for using a `match` is the exhaustiveness checks as long as there isn't
+an `else` block then the compiler will output an error for `non-exhaustive patterns` if not all
+branches of the `match/many` are exhaustive.
+
+Implementation Assumptions:
+1. Assuming that a `match` expression is currently implemented similar to a long chain of
+`if/else if` expressions. By this, meaning that each branch is checked one at a time and if it
+matches then it skips checking any of the other branches and jumps to the end of the expression.
+
+Implementation:
+1. This can be implemented as if it was a list of `if` expressions. And a flag to check if any
+of the branches have been visited so as to not visit the `else`
+2. To cover the `else` case the location to jump to at the end after checking all the branches
+can be stored, initially set to the start of the `else` block but if it enters any of the
+branches then it is set to immediately after the `else` block.
+
+# How We Teach This
+[how-we-teach-this]: #how-we-teach-this
+
+This should be called `match/many` expressions since that is the combination of keywords
+that are used. This idea would be best presented as a continuation of existing Rust patterns
+since it expands on the `match` expression.
+
+This proposal should be introduced to new users right after `match` expressions are taught. This
+is the best time to teach it since it appears as an extension of that syntax and the ideas that
+are used when using `match` expressions.
+
+Within the _Rust Book_ a section after the section on the `_` placeholder could be called
+_match/in Control Flow Operator Addition_. Within this section the syntax and differences would
+be outlined. These would most notable include the multiple branches can be executed. The reader
+should be able to understand by the end of this section that this allows for multiple branches
+to be executed but it still will check for exhaustiveness when able. He should also know that
+the branches are checked top first.
+
+An example that could be used within the section:
+
+You can turn this:
+```rust
+match cmp.compare(&array[left], &array[right]) {
+    Less => {
+        merged.push(array[left]);
+        left += 1;
+    },
+    Equal => {
+        merged.push(array[left]);
+        merged.push(array[right]);
+        left += 1;
+        right += 1;
+    },
+    Greater => {
+        merged.push(array[right]);
+        right += 1;
+    }
+}
+```
+into
+```rust
+match many cmp.compare(&array[left], &array[right]) {
+    Less | Equal => {
+        merged.push(array[left]);
+        left += 1;
+    },
+    Greater | Equal => {
+        merged.push(array[right]);
+        right += 1;
+    }
+}
+```
+
+Another example is an implementation of fizzbuzz:
+
+```rust
+for x in 1...100 {
+    let mut res = String::from("");
+    if x % 5 == 0 {
+        res += "fizz";
+    }
+    if x % 7 == 0 {
+        res += "buzz";
+    }
+    if res.len() == 0 {
+        res = x.to_string();
+    }
+    println!("{}", res);
+}
+```
+into
+```rust
+for x in 1...100 {
+    match many x {
+        _ if x % 5 == 0 => print!("fizz"),
+        _ if x % 7 == 0 => print!("buzz")
+    } else {
+        print!("{}", x);
+    }
+    println!("");
+}
+```
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+This should not be done because it increases the size of language and might not be used by
+everyone.
+
+# Alternatives
+[alternatives]: #alternatives
+
+1. Instead of using `match` as a basis instead removing patterns from the equation and having
+some notation that asks the compiler to prove that some value will be set to true by the time
+a certain point in the code has been reached. This has some downfalls:
+    1. It requires the compiler to prove something as true which the compiler currently does not
+    do so that would require a lot more work.
+    2. There does not seem to be any syntax that makes sense to use in this case without adding
+    a new keyword and avoiding that is preferable
+2. Not doing anything, since the old code works and is somewhat usable this idea is not necessary
+to have and so not implementing it could be an option.
+
+# Unresolved questions
+[unresolved]: #unresolved-questions
+
+Whether or not `match/many` makes sense for this sort of control flow.