Parsing error comparison

gistfile1.txt

> ::hi()
mirb:
    Parsing Error: Can only reference constants when leaving out the lookup expression (Use ::Object to access non-constants)
    Input[1]: ::hi()
              ~~~~~~
mri:
    SyntaxError: (irb):6: syntax error, unexpected tIDENTIFIER, expecting tCONSTANT
    ::hi()
        ^

> def ().hi; end
mirb:
    Parsing Error: Expected expression
    Input[1]: def ().hi; end
                   ^
mri:
    SyntaxError: (irb):3: syntax error, unexpected ')'
    def ().hi; end
          ^
    (irb):3: syntax error, unexpected keyword_end, expecting $end

>def test a=3, &b, b; end
mirb:
    Parsing Error: Parameters with default values must come after regular parameters
    Input[1]: def test a=3, &b, b; end
                       ^
    Parsing Error: Block parameters must be last in the parameter list
    Input[1]: def test a=3, &b, b; end
                            ~~
    Parsing Error: Variable b already defined
    Input[1]: def test a=3, &b, b; end
                                ^
mri:
    SyntaxError: (irb):32: syntax error, unexpected ',', expecting ';' or '\n'
    def test a=3, &b, b; end
                     ^
    (irb):32: syntax error, unexpected keyword_end, expecting $end

>a, b + 2 = 1
mirb:
    Parsing Error: Not an assignable expression
    Input[1]: a, b + 2 = 1
                 ~~~~~
mri:
    SyntaxError: (irb):11: syntax error, unexpected '+', expecting '='
    a, b + 2 = 1
          ^