has_arg | Does the current call have an argument? |
is_binding_locked | Is the binding of a variable locked? |
is_debugged | Is the input function being debugged? |
is_error_free | Does the code run without throwing an error? |
is_existing | Does the variable exist? |
is_if_condition | Is suitable to be used as an if condition |
is_loaded | Is the input a symbol in a loaded DLL? |
is_valid_r_code | Is the input valid R code? |
is_valid_variable_name | Is the string a valid variable name? |
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