dartc doesn't namespace private globals in libraries

[DartBot]

This issue was originally filed by [email protected]

---

Consider these two libraries:

-- a.dart--

library("a");

final _private = 42;

afn ()=>_private;

-- b.dart--

library("b");

final _private = 22;

bfn () =>_private;

and a consumer:

--- import_dartc.dart ---

import("a.dart");

import("b.dart");

main() {
  print(afn());
  print(bfn());
}

---

With dart_bin this runs ok:
krukow:~/scratchpad$ dart_bin import_dartc.dart
42
22

With dartc we get a conflict:
krukow:~/scratchpad$ dartc import_dartc.dart
a.dart/a.dart:2: duplicate definition of _private
     1: #library("a");
     2: final _private = 42;

b.dart/b.dart:2: duplicate definition of _private
     1: #library("b");
     2: final _private = 22;

[DartBot]

This comment was originally written by [email protected]

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Added Area-Compiler, Triaged labels.

[kasperl]

Removed Area-Compiler label.
Added Area-Analyzer label.

[danrubel]

Added this to the M1 milestone.

[bwilkerson]

Dartc no longer produces JS and it is correctly not reporting any warnings or errors for this case.

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Set owner to @bwilkerson.
Added Invalid label.