R devel - Aug 2000 - Method dispatch fails for autoloaded methods (PR#642)

(As mentioned before, on R-devel)

This code snippet shows what the Subject above says :
> autoload("diff.ts", file="ts")
> diff(ts(1:10,freq=2))
Error in tsp<-(*tmp*, value = c(xtsp[1] + lag * differences * xtsp[3],  :
	invalid time series parameters specified
> traceback()
[1] "tsp<-(*tmp*, value = c(xtsp[1] + lag * differences * xtsp[3],
"
[2] "    xtsp[2], xtsp[3]))"
[3] "diff.default(ts(1:10, freq = 2))"
[4] "diff(ts(1:10, freq = 2))"

[The R version doesn't matter; this has been true for 1.1.x as well]

--please do not edit the information below--

Version:
 platform = i686-pc-linux-gnu
 arch = i686
 os = linux-gnu
 system = i686, linux-gnu
 status = Under development (unstable)
 major = 1
 minor = 2.0
 year = 2000
 month = 08
 day = 24
 language = R

Search Path:
 .GlobalEnv, package:SfS, Autoloads, package:base

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On Thu, 24 Aug 2000 maechler@stat.math.ethz.ch wrote:
> (As mentioned before, on R-devel)
> 
> This code snippet shows what the Subject above says :
The problem is that isFunction is false for diff.ts, since it is only a
promise, not a function.

I think the solution is for usemethod to force the promise (in lines 225ff
of objects.c), but I'm not sure how to do this.

	-thomas

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