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R-alpha: missing warning message

Friedrich Leisch 
In R it is possible to write nonsense 

R> 0.5:4:3:9:8:5
[1] 0.5 1.5 2.5 3.5 4.5

and never be warned about it, Splus does the expected thing:

Splus> 0.5:4:3:9:8:5
[1] 0.5 1.5 2.5 3.5 4.5
Warning messages:
1: Numerical expression has 4 elements: only the first used in: 0.5:4:3
2: Numerical expression has 3 elements: only the first used in: 0.5:4:3:9
3: Numerical expression has 9 elements: only the first used in: 0.5:4:3:9:8
4: Numerical expression has 8 elements: only the first used in: 0.5:4:3:9:8:5


Best,
Fritz

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