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var keyword for mutable locals only #2643

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@dherman

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@dherman

Issue #1273 proposed let mut for mutable locals and mut for mutable fields. let mut is more verbose than a single keyword and also breaks column alignment. People rightly didn't like the idea of var for mutable field declarations. But I think nobody suggested the idea of using var for mutable local declarations and mut for mutable field declarations:

let x = 7; // declaration of immutable variable x
var y = 7; // declaration of mutable variable y
type point = { mut x: int, mut y: int }; // declaration of mutable record type

Dave

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