eval handles non-standard shebang differently

[andrykonchin]

When a file contains non-standard shebang (e.g. in a puma config), CRuby raises "no Ruby script found in input" SyntaxError but #eval seems ignores it all. But Prism raises the Syntax error in both cases.

test.rb:

#!/usr/bin/env puma

puts 'Hello'

Prism.parse File.read("test.rb"), scopes: [[], []]
# =>
# #<Prism::ParseResult:0x00000001018edd50
#  @comments=[#<Prism::InlineComment @location=#<Prism::Location @start_offset=0 @length=19 start_line=1>>],
#  @data_loc=nil,
#  @errors=
#   [#<Prism::ParseError @type=:script_not_found @message="no Ruby script found in input" @location=#<Prism::Location @start_offset=0 @length=0 start_line=1> @level=:load>],
#  @magic_comments=[],
#  @source=
#   #<Prism::ASCIISource:0x0000000101948778
#    @offsets=[0, 20, 21, 34],
#    @source="#!/usr/bin/env puma\n\nputs 'Hello'\n",
#    @start_line=1>,
#  @value=
#   @ ProgramNode (location: (3,0)-(3,12))
#   ├── flags: ∅
#   ├── locals: []
#   └── statements:
#       @ StatementsNode (location: (3,0)-(3,12))
#       ├── flags: ∅
#       └── body: (length: 1)
#           └── @ CallNode (location: (3,0)-(3,12))
#               ├── flags: newline, ignore_visibility
#               ├── receiver: ∅
#               ├── call_operator_loc: ∅
#               ├── name: :puts
#               ├── message_loc: (3,0)-(3,4) = "puts"
#               ├── opening_loc: ∅
#               ├── arguments:
#               │   @ ArgumentsNode (location: (3,5)-(3,12))
#               │   ├── flags: ∅
#               │   └── arguments: (length: 1)
#               │       └── @ StringNode (location: (3,5)-(3,12))
#               │           ├── flags: ∅
#               │           ├── opening_loc: (3,5)-(3,6) = "'"
#               │           ├── content_loc: (3,6)-(3,11) = "Hello"
#               │           ├── closing_loc: (3,11)-(3,12) = "'"
#               │           └── unescaped: "Hello"
#               ├── closing_loc: ∅
#               └── block: ∅,
#  @warnings=[]>

eval File.read("test.rb")
# => Hello

The standard Ruby shebang #!/usr/bin/env ruby is parsed by Prism without errors.

The issue was reported originally in oracle/truffleruby#3623