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inherits(x, "a", TRUE) # 1
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inherits(x, "a", TRUE) # 1
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inherits(x, c("a", "b", "c"), TRUE) # 1 2 0
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inherits(x, c("a", "b", "c"), TRUE) # 1 2 0
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class( quote(pi) )           # "name"
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class( quote(pi) )           # "name"
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## regular calls
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## regular calls
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class( quote(sin(pi*x)) )    # "class"
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class( quote(sin(pi*x)) )    # "call"
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## special calls
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## special calls
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class( quote(x <- 1) )       # "<-"
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class( quote(x <- 1) )       # "<-"
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class( quote((1 < 2)) )      # "("
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class( quote((1 < 2)) )      # "("
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class( quote( if(8<3) pi ) ) # "if"
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class( quote( if(8<3) pi ) ) # "if"
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}
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}