F# under the covers VII

Working with nCover to examine the number of code-points represented by any given method, the October CTP made a large number of changes -- some up, some down -- to the code generated by the compiler.

Most interesting is the change to attribute setters, which used to be NOP;assign;return and are now just assign;return. Also the name of the implicit backing field has changed to be the property name with an appended '@', rather than being a case-mangled version of the property name.

(As always, talking about Debug builds).

Later ... This one is a bit too cryptic for me to decipher what I was writing about. Code like this:

	type internal Context = {
	Line : int;
	Column : int;
	EndLine : int;
	EndColumn : int }

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Has internal fields like Line@ still at 1.9.9.9; and property setters as in

	[<DefaultValue(true)>]
	val mutable private points : int
	member self.Points with get() = self.points and set(v) = self.points <- v

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compile to the NOP-bearing

	.method public specialname instance void set_Points(int32 v) cil managed
	{
	.maxstack 4
	L_0000: nop
	L_0001: ldarg.0
	L_0002: ldarg.1
	L_0003: stfld int32 MyTestClass::points
	L_0008: ret
	}

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with the Feb 2010 CTP.