Update Rust snippets

Add descriptions to Snipmate snippets, update some snippets for
changed/deprecated Rust features, add some new bits.

UltiSnips/rust.snippets

@@ -4,12 +4,34 @@
 
 priority -50
 
-snippet fn "A function, optionally with arguments and return type." b
+snippet let "let variable declaration" b
+let ${1:name}${2:: ${3:type}} = ${4};
+endsnippet
+
+snippet letm "let mut variable declaration" b
+let mut ${1:name}${2:: ${3:type}} = ${4};
+endsnippet
+
+snippet fn "A function, optionally with arguments and return type."
 fn ${1:function_name}(${2})${3/..*/ -> /}${3} {
 	${VISUAL}${0}
 }
 endsnippet
 
+snippet arg "Function Arguments" i
+${1:a}: ${2:T}${3:, arg}
+endsnippet
+
+snippet || "Closure, anonymous function (inline)" i
+${1:move }|${2}| { $3 }
+endsnippet
+
+snippet |} "Closure, anonymous function (block)" i
+${1:move }|${2}| {
+	$3
+}
+endsnippet
+
 snippet pri "print!(..)" b
 print!("${1}"${2/..*/, /}${2});
 endsnippet
@@ -52,18 +74,21 @@ struct ${1:`!p snip.rv = snip.basename.title() or "Name"`} {
 }
 endsnippet
 
+# TODO: fancy dynamic field mirroring like Python slotclass
 snippet stn "Struct with new constructor." b
 pub struct ${1:`!p snip.rv = snip.basename.title() or "Name"`} {
-	${3}
+	fd${0}
 }
 
 impl $1 {
 	pub fn new(${2}) -> $1 {
-		${4}return $1 {
-			${5}
-		};
+		$1 { ${3} };
 	}
 }
 endsnippet
 
+snippet fd "Struct field definition" w
+${1:name}: ${2:Type},
+endsnippet
+
 # vim:ft=snippets:

snippets/rust.snippets

@@ -3,11 +3,11 @@
 #################
 
 # Functions
-snippet fn
+snippet fn "Function definition"
 	fn ${1:function_name}(${2})${3} {
 		${0}
 	}
-snippet test
+snippet test "Unit test function"
 	#[test]
 	fn ${1:test_function_name}() {
 		${0}
@@ -19,32 +19,53 @@ snippet bench "Bench function" b
 			${0}
 		})
 	}
-snippet new
+snippet new "Constructor function"
 	pub fn new(${2}) -> ${1:Name} {
-		${0}return $1 { ${3} };
+		$1 { ${3} };
 	}
-snippet main
+snippet main "Main function"
 	pub fn main() {
 		${0}
 	}
-snippet let
-	let ${1:name: type} = ${2};
-snippet let
-	let mut ${1:name: type} = ${2};
-snippet pln
+snippet let "let variable declaration"
+	let ${1:name}${2:: ${3:type}} = ${4};
+snippet letm "let mut variable declaration"
+	let mut ${1:name}${2:: ${3:type}} = ${4};
+snippet pln "println!"
 	println!("${1}");
-snippet pln,
+snippet pln, "println! with format param"
 	println!("${1}", ${2});
-snippet ec
+
+# Modules
+snippet ec "extern crate"
 	extern crate ${1:sync};
-snippet ecl
-	#![feature(phase)]
-	#[phase(plugin, link)] extern crate log;
+snippet ecl "extern crate log"
+	#[macro_use]
+	extern crate log;
 snippet mod
 	mod ${1:`substitute(vim_snippets#Filename(), '\(_\|^\)\(.\)', '\u\2', 'g')`} {
 		${0}
 	} /* $1 */
-snippet crate
+snippet testmod "Test module" b
+	#[cfg(test)]
+	mod tests {
+		use super::${1:*};
+
+		test${0}
+	}
+
+# Attributes
+snippet allow "allow lint attribute" b
+	#[allow(${1:unused_variable})]
+snippet cfg "cfg attribute" b
+	#[cfg(${1:target_os = "linux"})]
+snippet feat "feature attribute" b
+	#![feature(${1:plugin})]
+snippet der "#[derive(..)]" b
+	#[derive(${1:Debug})]
+snippet attr "#[..]" b
+	#[${1:inline}]
+snippet crate "Define create meta attributes"
 	// Crate name
 	#![crate_name = "${1:crate_name}"]
 	// Additional metadata attributes
@@ -53,39 +74,33 @@ snippet crate
 	#![comment = "${4:Comment.}"]
 	// Specify the output type
 	#![crate_type = "${5:lib}"]
-snippet allow
-	#[allow(${1:unused_variable})]
-snippet feat
-	#![feature(${1:macro_rules})]
-snippet der "#[deriving(..)]" b
-	#[deriving(${1:Show})]
-snippet attr "#[..]" b
-	#[${1:inline}]
 
 # Common types
-snippet opt
-	Option<${1:int}>
-snippet res
+snippet opt "Option<T>"
+	Option<${1:i32}>
+snippet res "Result<T, E>"
 	Result<${1:~str}, ${2:()}>
+
+# Control structures
 snippet if
 	if ${1} {
 		${0}
 	}
-snippet ife
+snippet ife "if / else"
 	if ${1} {
 		${2}
 	} else {
 		${0}
 	}
-snippet el
+snippet el "else"
 	else {
 		${0}
 	}
-snippet eli
+snippet eli "else if"
 	else if ${1} {
 		${0}
 	}
-snippet mat
+snippet mat "match pattern"
 	match ${1} {
 		${2} => ${3},
 	}
@@ -93,70 +108,72 @@ snippet loop "loop {}" b
 	loop {
 		${0}
 	}
-snippet while
+snippet while "while loop"
 	while ${1:condition} {
 		${0}
 	}
-snippet for
+snippet for "for ... in ... loop"
 	for ${1:i} in ${2:0u..10} {
 		${0}
 	}
-snippet spawn
-	spawn(proc() {
-		${0}
-	});
-snippet chan
-	let (${1:tx}, ${2:rx}): (Sender<${3:int}>, Receiver<${4:int}>) = channel();
-snippet duplex
-	let (${1:from_child}, ${2:to_child}) = sync::duplex();
 # TODO commenting
-snippet todo
+snippet todo "TODO comment"
 	// [TODO]: ${0:Description}
 snippet fixme "FIXME comment"
 	// FIXME: $0
 
 # Struct
-snippet st
+snippet st "Struct definition"
 	struct ${1:`substitute(vim_snippets#Filename(), '\(_\|^\)\(.\)', '\u\2', 'g')`} {
 		${0}
 	}
-snippet stn
-	struct ${1:`substitute(vim_snippets#Filename(), '\(_\|^\)\(.\)', '\u\2', 'g')`} {
+snippet impl "Struct/Trait implementation"
+	impl ${1:Type/Trait}${2: ${3:for Type}} {
+		${0}
+	}
+snippet stn "Struct with new constructor"
+	pub struct ${1:`substitute(vim_snippets#Filename(), '\(_\|^\)\(.\)', '\u\2', 'g')`} {
 		${0}
 	}
 
 	impl $1 {
 		pub fn new(${2}) -> $1 {
-			${4}return $1 {
-				${5}
-			};
+			$1 { ${3} };
 		}
 	}
-snippet typ
-	type ${1:NewName} = $0;
-# Enum
-snippet enum
+snippet type "Type alias"
+	type ${1:NewName} = $2;
+snippet enum "enum definition"
 	enum ${1:Name} {
-		${0},
+		${2},
 	}
-# Impl
-snippet imp
-	impl ${1:Name} {
+# Traits
+snippet trait "Trait definition"
+	trait ${1:Name} {
 		${0}
 	}
-snippet drop
+snippet drop "Drop trait implementation (destructor)"
 	impl Drop for ${1:Name} {
 		fn drop(&mut self) {
 			${0}
 		}
 	}
-# Traits
-snippet trait
-	trait ${1:Name} {
-		${0}
-	}
 # Statics
-snippet ss
+snippet ss "static string declaration"
 	static ${1}: &'static str = "${0}";
-snippet stat
+snippet stat "static item declaration"
 	static ${1}: ${2:usize} = ${0};
+
+# Concurrency
+snippet spawn "spawn a task or thread"
+	spawn(proc() {
+		${0}
+	});
+snippet chan "Declare (Sender, Receiver) pair of asynchronous channel()"
+	let (${1:tx}, ${2:rx}): (Sender<${3:i32}>, Receiver<${4:i32}>) = channel();
+
+# Testing
+snippet as "assert!"
+	assert!(${1:predicate})
+snippet ase "assert_eq!"
+	assert_eq!(${1:expected}, ${2:actual})