Remove the proc keyword from the language

text/0000-remove-proc-keyword.md

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+- Start Date: 2015-01-14
+- RFC PR: (leave this empty)
+- Rust Issue: (leave this empty)
+
+# Summary
+
+Remove the `proc` keyword from the language.
+
+# Motivation
+
+With the removal of the proc construct, the keyword has no use currently.
+Freeing it would allow using `proc` as an identifier name.
+
+# Detailed design
+
+Remove the keyword status of `proc`, allowing it to be treated as an
+identifier.
+
+# Drawbacks
+
+We might want to use the `proc` keyword for something in the future.
+Reintroducing it as a keyword would be a backwards-incompatible change.
+
+# Alternatives
+
+Keep `proc` as a reserved keyword.
+
+# Unresolved questions
+
+Why wasn't the `proc` keyword removed along with the proc construct?
+Were there any plans with it?