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# verifies result types and length

    Code
      pmap_int(list(1), ~"x")
    Condition
      Error in `pmap_int()`:
      i In index: 1.
      Caused by error:
      ! Can't coerce from a character vector to an integer vector.
    Code
      pmap_int(list(1), ~ 1:2)
    Condition
      Error in `pmap_int()`:
      i In index: 1.
      Caused by error:
      ! Result must be length 1, not 2.
    Code
      pmap_vec(list(1), ~1, .ptype = character())
    Condition
      Error in `pmap_vec()`:
      ! Can't convert `<list>[[1]]` <double> to <character>.

# requires list of vectors

    Code
      pmap(environment(), identity)
    Condition
      Error in `pmap()`:
      ! `.l` must be a list, not an environment.
    Code
      pmap(list(environment()), identity)
    Condition
      Error in `pmap()`:
      ! `.l[[1]]` must be a vector, not an environment.

# recycles inputs

    Code
      pmap(list(1:2, 1:3), `+`)
    Condition
      Error in `pmap()`:
      ! Can't recycle `.l[[1]]` (size 2) to match `.l[[2]]` (size 3).
    Code
      pmap(list(1:2, integer()), `+`)
    Condition
      Error in `pmap()`:
      ! Can't recycle `.l[[1]]` (size 2) to match `.l[[2]]` (size 0).

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