Keyboard shortcuts

Press ← or → to navigate between chapters

Press S or / to search in the book

Press ? to show this help

Press Esc to hide this help

duplicated-arguments

Flag a call that supplies the same argument name more than once (f(a = 1, a = 2)). The call-side sibling of duplicate-formal; reported as a warning with no autofix, since it isn’t always a runtime error.

The argument a is supplied twice:

list(a = 1, a = 2)

warning: duplicated-arguments
 --> example.R:1:13
  |
1 | list(a = 1, a = 2)
  |             ^ argument `a` is supplied more than once in this call
  = help: Remove or rename the duplicate argument.