Clojure

Clojure loses quoted metadata on empty literals

Details

  • Type: Defect Defect
  • Status: Open Open
  • Priority: Minor Minor
  • Resolution: Unresolved
  • Affects Version/s: Release 1.5, Release 1.6
  • Fix Version/s: Release 1.7
  • Component/s: None
  • Labels:
    None
  • Patch:
    Code and Test
  • Approval:
    Vetted

Description

meta on empty collections is lost:

user=> (meta '^:foo [])
nil   ;; expected {:foo true} as in:
user=> (meta '^:foo [1])
{:foo true}

This bug propagates to ^:const vars:

user=> (def ^:const foo ^:foo [])
#'user/foo
user=> (meta foo)
nil
user=> (meta @#'foo)
{:foo true}

Cause: As in CLJ-1093, empty collections are replaced with an EmptyExpr that loses meta

Proposed: Don't replace with EmptyExpr if meta is present.

Patch: 001-CLJ-1187.patch (NOTE: this change overlaps with CLJ-1093 and the patch there may be preferred)

Screened by:

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Dates

  • Created:
    Updated: