[ruby/prism] Reconfigure error tests

https://github.com/ruby/prism/commit/fb7e1ebb7f

lib/prism/parse_result.rb

@@ -575,6 +575,7 @@ module Prism
   # This is a result specific to the `parse` and `parse_file` methods.
   class ParseResult < Result
     autoload :Comments, "prism/parse_result/comments"
+    autoload :Errors, "prism/parse_result/errors"
     autoload :Newlines, "prism/parse_result/newlines"
 
     private_constant :Comments
@@ -604,6 +605,12 @@ module Prism
     def mark_newlines!
       value.accept(Newlines.new(source.offsets.size)) # steep:ignore
     end
+
+    # Returns a string representation of the syntax tree with the errors
+    # displayed inline.
+    def errors_format
+      Errors.new(self).format
+    end
   end
 
   # This is a result specific to the `lex` and `lex_file` methods.

lib/prism/parse_result/errors.rb

@@ -0,0 +1,60 @@
+# frozen_string_literal: true
+
+require "stringio"
+
+module Prism
+  class ParseResult < Result
+    class Errors
+      attr_reader :parse_result
+
+      def initialize(parse_result)
+        @parse_result = parse_result
+      end
+
+      def format
+        error_lines = {}
+        parse_result.errors.each do |error|
+          location = error.location
+          (location.start_line..location.end_line).each do |line|
+            error_lines[line] ||= []
+            error_lines[line] << error
+          end
+        end
+
+        source_lines = parse_result.source.source.lines
+        source_lines << "" if error_lines.key?(source_lines.size + 1)
+
+        io = StringIO.new
+        source_lines.each.with_index(1) do |line, line_number|
+          io.puts(line)
+  
+          (error_lines.delete(line_number) || []).each do |error|
+            location = error.location
+  
+            case line_number
+            when location.start_line
+              io.print(" " * location.start_column + "^")
+  
+              if location.start_line == location.end_line
+                if location.start_column != location.end_column
+                  io.print("~" * (location.end_column - location.start_column - 1))
+                end
+  
+                io.puts(" " + error.message)
+              else
+                io.puts("~" * (line.bytesize - location.start_column))
+              end
+            when location.end_line
+              io.puts("~" * location.end_column + " " + error.message)
+            else
+              io.puts("~" * line.bytesize)
+            end
+          end
+        end
+  
+        io.puts
+        io.string
+      end
+    end
+  end
+end

test/prism/errors/1_2_3.txt

@@ -0,0 +1,11 @@
+(1, 2, 3)
+  ^ unexpected ',', expecting end-of-input
+  ^ unexpected ',', ignoring it
+  ^ expected a matching `)`
+  ^ unexpected ',', expecting end-of-input
+  ^ unexpected ',', ignoring it
+     ^ unexpected ',', expecting end-of-input
+     ^ unexpected ',', ignoring it
+        ^ unexpected ')', expecting end-of-input
+        ^ unexpected ')', ignoring it
+

test/prism/errors/aliasing_global_variable_with_global_number_variable.txt

@@ -0,0 +1,3 @@
+alias $a $1
+         ^~ invalid argument being passed to `alias`; can't make alias for the number variables
+

test/prism/errors/aliasing_global_variable_with_non_global_variable.txt

@@ -0,0 +1,3 @@
+alias $a b
+         ^ invalid argument being passed to `alias`; expected a bare word, symbol, constant, or global variable
+

test/prism/errors/aliasing_non_global_variable_with_global_variable.txt

@@ -0,0 +1,3 @@
+alias a $b
+        ^~ invalid argument being passed to `alias`; expected a bare word, symbol, constant, or global variable
+

test/prism/errors/alnum_delimiters.txt

@@ -0,0 +1,3 @@
+%qXfooX
+^ unknown type of %string
+

test/prism/errors/alnum_delimiters_2.txt

@@ -0,0 +1,3 @@
+%QXfooX
+^ unknown type of %string
+

test/prism/errors/alnum_delimiters_3.txt

@@ -0,0 +1,3 @@
+%wXfooX
+^ unknown type of %string
+

test/prism/errors/alnum_delimiters_4.txt

@@ -0,0 +1,3 @@
+%WxfooX
+^ unknown type of %string
+

test/prism/errors/alnum_delimiters_5.txt

@@ -0,0 +1,3 @@
+%iXfooX
+^ unknown type of %string
+

test/prism/errors/alnum_delimiters_6.txt

@@ -0,0 +1,3 @@
+%IXfooX
+^ unknown type of %string
+

test/prism/errors/alnum_delimiters_7.txt

@@ -0,0 +1,3 @@
+%xXfooX
+^ unknown type of %string
+

test/prism/errors/alnum_delimiters_8.txt

@@ -0,0 +1,3 @@
+%rXfooX
+^ unknown type of %string
+

test/prism/errors/alnum_delimiters_9.txt

@@ -0,0 +1,3 @@
+%sXfooX
+^ unknown type of %string
+

test/prism/errors/argument_after_ellipsis.txt

@@ -0,0 +1,3 @@
+def foo(...); foo(..., 1); end
+                       ^ unexpected argument after `...`
+

test/prism/errors/argument_forwarding_only_effects_its_own_internals.txt

@@ -0,0 +1,3 @@
+def a(...); b(...); end; def c(x, y, z); b(...); end
+                                           ^~~ unexpected ... when the parent method is not forwarding
+

test/prism/errors/argument_forwarding_when_parent_is_not_forwarding.txt

@@ -0,0 +1,3 @@
+def a(x, y, z); b(...); end
+                  ^~~ unexpected ... when the parent method is not forwarding
+

test/prism/errors/arguments_after_block.txt

@@ -0,0 +1,3 @@
+a(&block, foo)
+          ^~~ unexpected argument after a block argument
+

test/prism/errors/arguments_binding_power_for_and.txt

@@ -0,0 +1,5 @@
+foo(*bar and baz)
+         ^~~ unexpected 'and'; expected a `)` to close the arguments
+                ^ unexpected ')', expecting end-of-input
+                ^ unexpected ')', ignoring it
+

test/prism/errors/assign_to_numbered_parameter.txt

@@ -0,0 +1,11 @@
+a in _1
+     ^~ _1 is reserved for numbered parameters
+a => _1
+     ^~ _1 is reserved for numbered parameters
+1 => a, _1
+        ^~ _1 is reserved for numbered parameters
+1 in a, _1
+        ^~ _1 is reserved for numbered parameters
+/(?<_1>)/ =~ a
+    ^~ _1 is reserved for numbered parameters
+

test/prism/errors/bad_arguments.txt

@@ -0,0 +1,6 @@
+def foo(A, @a, $A, @@a);end
+        ^ invalid formal argument; formal argument cannot be a constant
+           ^~ invalid formal argument; formal argument cannot be an instance variable
+               ^~ invalid formal argument; formal argument cannot be a global variable
+                   ^~~ invalid formal argument; formal argument cannot be a class variable
+

test/prism/errors/begin_at_toplevel.txt

@@ -0,0 +1,3 @@
+def foo; BEGIN {}; end
+         ^~~~~ BEGIN is permitted only at toplevel
+

test/prism/errors/binary_range_with_left_unary_range.txt

@@ -0,0 +1,7 @@
+..1..
+   ^~ unexpected range operator; .. and ... are non-associative and cannot be chained
+...1..
+    ^~ unexpected range operator; .. and ... are non-associative and cannot be chained
+    ^~ unexpected .., expecting end-of-input
+    ^~ unexpected .., ignoring it
+

test/prism/errors/block_arg_and_block.txt

@@ -0,0 +1,3 @@
+foo(&1) { }
+        ^~~ both block arg and actual block given; only one block is allowed
+

test/prism/errors/block_beginning_with_brace_and_ending_with_end.txt

@@ -0,0 +1,6 @@
+x.each { x end
+           ^~~ unexpected 'end', expecting end-of-input
+           ^~~ unexpected 'end', ignoring it
+              ^ unexpected end-of-input, assuming it is closing the parent top level context
+              ^ expected a block beginning with `{` to end with `}`
+

test/prism/errors/break_1.txt

@@ -0,0 +1,4 @@
+break 1,;
+       ^ expected an argument
+^~~~~~~~ Invalid break
+

test/prism/errors/break_1_2_3.txt

@@ -0,0 +1,8 @@
+break(1, 2, 3)
+       ^ unexpected ',', expecting end-of-input
+       ^ unexpected ',', ignoring it
+       ^ expected a matching `)`
+             ^ unexpected ')', expecting end-of-input
+             ^ unexpected ')', ignoring it
+^~~~~~~~~~~~~ Invalid break
+

test/prism/errors/call_with_block_and_write.txt

@@ -0,0 +1,4 @@
+foo {} &&= 1
+^~~~~~ unexpected write target
+       ^~~ unexpected operator after a call with a block
+

test/prism/errors/call_with_block_operator_write.txt

@@ -0,0 +1,4 @@
+foo {} += 1
+^~~~~~ unexpected write target
+       ^~ unexpected operator after a call with a block
+

test/prism/errors/call_with_block_or_write.txt

@@ -0,0 +1,4 @@
+foo {} ||= 1
+^~~~~~ unexpected write target
+       ^~~ unexpected operator after a call with a block
+

test/prism/errors/cannot_assign_to_a_reserved_numbered_parameter.txt

@@ -0,0 +1,14 @@
+begin
+  _1=:a;_2=:a;_3=:a;_4=:a;_5=:a
+  ^~ _1 is reserved for numbered parameters
+        ^~ _2 is reserved for numbered parameters
+              ^~ _3 is reserved for numbered parameters
+                    ^~ _4 is reserved for numbered parameters
+                          ^~ _5 is reserved for numbered parameters
+  _6=:a;_7=:a;_8=:a;_9=:a;_10=:a
+  ^~ _6 is reserved for numbered parameters
+        ^~ _7 is reserved for numbered parameters
+              ^~ _8 is reserved for numbered parameters
+                    ^~ _9 is reserved for numbered parameters
+end
+

test/prism/errors/case_without_clauses.txt

@@ -0,0 +1,4 @@
+case :a
+^~~~ expected a `when` or `in` clause after `case`
+end
+

test/prism/errors/case_without_when_clauses_errors_on_else_clause.txt

@@ -0,0 +1,5 @@
+case :a
+^~~~ expected a `when` or `in` clause after `case`
+else
+end
+

test/prism/errors/check_value_expression.txt

@@ -0,0 +1,20 @@
+1 => ^(return)
+       ^~~~~~ unexpected void value expression
+while true
+  1 => ^(break)
+         ^~~~~ unexpected void value expression
+  1 => ^(next)
+         ^~~~ unexpected void value expression
+  1 => ^(redo)
+         ^~~~ unexpected void value expression
+  1 => ^(retry)
+         ^~~~~ Invalid retry without rescue
+         ^~~~~ unexpected void value expression
+  1 => ^(2 => a)
+         ^~~~~~ unexpected void value expression
+end
+1 => ^(if 1; (return) else (return) end)
+              ^~~~~~ unexpected void value expression
+1 => ^(unless 1; (return) else (return) end)
+                  ^~~~~~ unexpected void value expression
+

test/prism/errors/class_definition_in_method_body.txt

@@ -0,0 +1,3 @@
+def foo;class A;end;end
+        ^~~~~ unexpected class definition in method body
+

test/prism/errors/class_definition_in_method_defs.txt

@@ -0,0 +1,7 @@
+def foo(bar = class A;end);end
+              ^~~~~ unexpected class definition in method body
+def foo;rescue;class A;end;end
+               ^~~~~ unexpected class definition in method body
+def foo;ensure;class A;end;end
+               ^~~~~ unexpected class definition in method body
+

test/prism/errors/class_name.txt

@@ -0,0 +1,3 @@
+class 0.X end
+      ^~~ unexpected constant path after `class`; class/module name must be CONSTANT
+

test/prism/errors/command_call_in.txt

@@ -0,0 +1,7 @@
+foo 1 in a
+         ^ unexpected `in` keyword in arguments
+         ^ unexpected local variable or method, expecting end-of-input
+a = foo 2 in b
+             ^ unexpected `in` keyword in arguments
+             ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls.txt

@@ -0,0 +1,3 @@
+[a b]
+  ^ unexpected local variable or method; expected a `,` separator for the array elements
+

test/prism/errors/command_calls_10.txt

@@ -0,0 +1,3 @@
++a b
+   ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_11.txt

@@ -0,0 +1,3 @@
+a + b c
+      ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_12.txt

@@ -0,0 +1,3 @@
+a && b c
+       ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_13.txt

@@ -0,0 +1,3 @@
+a =~ b c
+       ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_14.txt

@@ -0,0 +1,3 @@
+a = b, c d
+         ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_15.txt

@@ -0,0 +1,3 @@
+a = *b c
+       ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_16.txt

@@ -0,0 +1,3 @@
+a, b = c = d f
+             ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_17.txt

@@ -0,0 +1,5 @@
+a ? b c : d e
+     ^ expected a `:` after the true expression of a ternary operator
+        ^ unexpected ':', expecting end-of-input
+        ^ unexpected ':', ignoring it
+

test/prism/errors/command_calls_18.txt

@@ -0,0 +1,3 @@
+defined? a b
+           ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_19.txt

@@ -0,0 +1,3 @@
+! ! a b
+      ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_2.txt

@@ -0,0 +1,6 @@
+{a: b c}
+     ^ expected a `}` to close the hash literal
+      ^ unexpected local variable or method, expecting end-of-input
+       ^ unexpected '}', expecting end-of-input
+       ^ unexpected '}', ignoring it
+

test/prism/errors/command_calls_20.txt

@@ -0,0 +1,3 @@
+def f a = b c; end
+           ^ expected a delimiter to close the parameters
+

test/prism/errors/command_calls_21.txt

@@ -0,0 +1,5 @@
+def f(a = b c); end
+            ^ unexpected local variable or method; expected a `)` to close the parameters
+             ^ unexpected ')', expecting end-of-input
+             ^ unexpected ')', ignoring it
+

test/prism/errors/command_calls_22.txt

@@ -0,0 +1,3 @@
+a = b rescue c d
+               ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_23.txt

@@ -0,0 +1,3 @@
+def a = b rescue c d
+                   ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_24.txt

@@ -0,0 +1,5 @@
+->a=b c{}
+     ^ expected a `do` keyword or a `{` to open the lambda block
+         ^ unexpected end-of-input, assuming it is closing the parent top level context
+         ^ expected a lambda block beginning with `do` to end with `end`
+

test/prism/errors/command_calls_25.txt

@@ -0,0 +1,8 @@
+->(a=b c){}
+      ^ expected a matching `)`
+      ^ expected a `do` keyword or a `{` to open the lambda block
+        ^ unexpected ')', expecting end-of-input
+        ^ unexpected ')', ignoring it
+           ^ unexpected end-of-input, assuming it is closing the parent top level context
+           ^ expected a lambda block beginning with `do` to end with `end`
+

test/prism/errors/command_calls_26.txt

@@ -0,0 +1,3 @@
+case; when a b; end
+            ^ expected a delimiter after the predicates of a `when` clause
+

test/prism/errors/command_calls_27.txt

@@ -0,0 +1,3 @@
+case; in a if a b; end
+^~~~ expected a predicate for a case matching statement
+

test/prism/errors/command_calls_28.txt

@@ -0,0 +1,3 @@
+case; in a unless a b; end
+^~~~ expected a predicate for a case matching statement
+

test/prism/errors/command_calls_29.txt

@@ -0,0 +1,3 @@
+begin; rescue a b; end
+               ^ expected a closing delimiter for the `rescue` clause
+

test/prism/errors/command_calls_3.txt

@@ -0,0 +1,3 @@
+...a b
+     ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_30.txt

@@ -0,0 +1,3 @@
+begin; rescue a b => c; end
+               ^ expected a closing delimiter for the `rescue` clause
+

test/prism/errors/command_calls_4.txt

@@ -0,0 +1,3 @@
+if ...a b; end
+        ^ expected `then` or `;` or '\n'
+

test/prism/errors/command_calls_5.txt

@@ -0,0 +1,3 @@
+a b, c d
+       ^ unexpected local variable or method, expecting end-of-input
+

test/prism/errors/command_calls_6.txt

@@ -0,0 +1,6 @@
+a(b, c d)
+       ^ unexpected local variable or method; expected a `)` to close the arguments
+       ^ unexpected local variable or method, expecting end-of-input
+        ^ unexpected ')', expecting end-of-input
+        ^ unexpected ')', ignoring it
+

test/prism/errors/command_calls_7.txt

@@ -0,0 +1,6 @@
+a(*b c)
+     ^ unexpected local variable or method; expected a `)` to close the arguments
+     ^ unexpected local variable or method, expecting end-of-input
+      ^ unexpected ')', expecting end-of-input
+      ^ unexpected ')', ignoring it
+

test/prism/errors/command_calls_8.txt

@@ -0,0 +1,6 @@
+a(**b c)
+      ^ unexpected local variable or method; expected a `)` to close the arguments
+      ^ unexpected local variable or method, expecting end-of-input
+       ^ unexpected ')', expecting end-of-input
+       ^ unexpected ')', ignoring it
+

test/prism/errors/command_calls_9.txt

@@ -0,0 +1,6 @@
+a(&b c)
+     ^ unexpected local variable or method; expected a `)` to close the arguments
+     ^ unexpected local variable or method, expecting end-of-input
+      ^ unexpected ')', expecting end-of-input
+      ^ unexpected ')', ignoring it
+

test/prism/errors/conditional_predicate_closed.txt

@@ -0,0 +1,6 @@
+if 0 0; elsif 0 0; end
+     ^ expected `then` or `;` or '\n'
+                ^ expected `then` or `;` or '\n'
+unless 0 0; end
+         ^ expected `then` or `;` or '\n'
+

test/prism/errors/constant_assignment_in_method.txt

@@ -0,0 +1,3 @@
+def foo();A=1;end
+          ^~~ dynamic constant assignment
+

test/prism/errors/constant_path_with_invalid_token_after.txt

@@ -0,0 +1,4 @@
+A::$b
+   ^ expected a constant after the `::` operator
+   ^~ unexpected global variable, expecting end-of-input
+

test/prism/errors/content_after_unterminated_heredoc.txt

@@ -0,0 +1,2 @@
+<<~FOO.foo
+   ^~~ unterminated heredoc; can't find string "FOO" anywhere before EOF

test/prism/errors/cr_without_lf_in_percent_expression.txt

@@ -0,0 +1,3 @@
+%
+  ^ unterminated string meets end of file
+

test/prism/errors/def_with_empty_expression_receiver.txt

@@ -0,0 +1,3 @@
+def ().a; end
+    ^ expected a receiver for the method definition
+

test/prism/errors/def_with_expression_receiver_and_no_identifier.txt

@@ -0,0 +1,4 @@
+def (a); end
+       ^ expected a `.` or `::` after the receiver in a method definition
+       ^ unexpected ';'; expected a method name
+

test/prism/errors/def_with_multiple_statements_receiver.txt

@@ -0,0 +1,10 @@
+def (
+a
+b
+^ expected a matching `)`
+^ expected a `.` or `::` after the receiver in a method definition
+ ^ expected a delimiter to close the parameters
+).c; end
+^ unexpected ')', ignoring it
+ ^ unexpected '.', ignoring it
+

test/prism/errors/defining_numbered_parameter.txt

@@ -0,0 +1,3 @@
+def _1; end
+    ^~ _1 is reserved for numbered parameters
+

test/prism/errors/defining_numbered_parameter_2.txt

@@ -0,0 +1,3 @@
+def self._1; end
+         ^~ _1 is reserved for numbered parameters
+

test/prism/errors/do_not_allow_characters_other_than_0_9_a_f_and_A_F_in_u_Unicode_character_notation.txt

@@ -0,0 +1,4 @@
+"\u{000z}"
+       ^ invalid Unicode escape sequence
+       ^ unterminated Unicode escape
+

test/prism/errors/do_not_allow_forward_arguments_in_blocks.txt

@@ -0,0 +1,3 @@
+a {|...|}
+    ^~~ unexpected ... when the parent method is not forwarding
+

test/prism/errors/do_not_allow_forward_arguments_in_lambda_literals.txt

@@ -0,0 +1,3 @@
+->(...) {}
+   ^~~ unexpected ... when the parent method is not forwarding
+

test/prism/errors/do_not_allow_more_than_6_hexadecimal_digits_in_u_Unicode_character_notation.txt

@@ -0,0 +1,3 @@
+"\u{0000001}"
+    ^~~~~~~ invalid Unicode escape sequence; maximum length is 6 digits
+

test/prism/errors/do_not_allow_multiple_codepoints_in_a_single_character_literal.txt

@@ -0,0 +1,3 @@
+?\u{0001 0002}
+         ^~~ invalid Unicode escape sequence; Multiple codepoints at single character literal are disallowed
+

test/prism/errors/do_not_allow_trailing_commas_in_lambda_parameters.txt

@@ -0,0 +1,3 @@
+-> (a, b, ) {}
+        ^ unexpected `,` in parameters
+

test/prism/errors/do_not_allow_trailing_commas_in_method_parameters.txt

@@ -0,0 +1,3 @@
+def foo(a,b,c,);end
+             ^ unexpected `,` in parameters
+

test/prism/errors/dont_allow_return_inside_class_body.txt

@@ -0,0 +1,3 @@
+class A; return; end
+         ^~~~~~ Invalid return in class/module body
+

test/prism/errors/dont_allow_return_inside_module_body.txt

@@ -0,0 +1,3 @@
+module A; return; end
+          ^~~~~~ Invalid return in class/module body
+

test/prism/errors/dont_allow_setting_to_back_and_nth_reference.txt

@@ -0,0 +1,7 @@
+begin
+$+ = nil
+^~ Can't set variable $+
+$1466 = nil
+^~~~~ Can't set variable $1466
+end
+

test/prism/errors/double_arguments_forwarding.txt

@@ -0,0 +1,4 @@
+def foo(..., ...)
+             ^~~ unexpected parameter order
+end
+

test/prism/errors/double_scope_numbered_parameters.txt

@@ -0,0 +1,3 @@
+-> { _1 + -> { _2 } }
+               ^~ numbered parameter is already used in outer block
+

test/prism/errors/double_splat_followed_by_splat_argument.txt

@@ -0,0 +1,3 @@
+a(**kwargs, *args)
+            ^~~~~ unexpected `*` splat argument after a `**` keyword splat argument
+

test/prism/errors/duplicate_pattern_capture.txt

@@ -0,0 +1,17 @@
+case (); in [a, a]; end
+                ^ duplicated variable name
+case (); in [a, *a]; end
+                 ^ duplicated variable name
+case (); in {a: a, b: a}; end
+                      ^ duplicated variable name
+case (); in {a: a, **a}; end
+                     ^ duplicated variable name
+case (); in [a, {a:}]; end
+                 ^ duplicated variable name
+case (); in [a, {a: {a: {a: [a]}}}]; end
+                             ^ duplicated variable name
+case (); in a => a; end
+                 ^ duplicated variable name
+case (); in [A => a, {a: b => a}]; end
+                              ^ duplicated variable name
+

test/prism/errors/duplicate_pattern_hash_key.txt

@@ -0,0 +1,4 @@
+case (); in {a:, a:}; end
+                 ^~ duplicated key name
+                 ^ duplicated variable name
+

test/prism/errors/duplicate_pattern_hash_key_2.txt

@@ -0,0 +1,3 @@
+case (); in {a:1, a:2}; end
+                  ^~ duplicated key name
+

test/prism/errors/duplicated_parameter_names.txt

@@ -0,0 +1,3 @@
+def foo(a,b,a);end
+            ^ duplicated argument name
+

test/prism/errors/duplicated_parameter_names_2.txt

@@ -0,0 +1,3 @@
+def foo(a,b,*a);end
+             ^ duplicated argument name
+

test/prism/errors/duplicated_parameter_names_3.txt

@@ -0,0 +1,3 @@
+def foo(a,b,**a);end
+              ^ duplicated argument name
+

test/prism/errors/duplicated_parameter_names_4.txt

@@ -0,0 +1,3 @@
+def foo(a,b,&a);end
+             ^ duplicated argument name
+

test/prism/errors/duplicated_parameter_names_5.txt

@@ -0,0 +1,3 @@
+def foo(a = 1,b,*c);end
+                ^ unexpected parameter `*`
+