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v1.8.x - yyyy-mm-dd

Changes affecting backward compatibility

  • The Math.trunc polyfill for targeting Internet Explorer was previously emitted for every JavaScript output file except if the symbol nodejs was defined via -d:nodejs. Now, it is only emitted if the symbol nimJsMathTruncPolyfill is defined. If you are targeting Internet Explorer, you may choose to enable this option or define your own Math.trunc polyfill using the emit pragma. Nim uses Math.trunc for the division and modulo operators for integers.

  • Deprecated std/sums.

  • Optional parameters in combination with : body syntax (RFC #405) are now opt-in via experimental:flexibleOptionalParams.

  • std/sharedstrings module is removed.

  • Constants colors.colPaleVioletRed and colors.colMediumPurple changed to match the CSS color standard.

  • addr is now available for all addressable locations, unsafeAddr is deprecated and becomes an alias for addr.

  • io and assertions are about to move out of system; use -d:nimPreviewSlimSystem, import std/syncio and import std/assertions.

  • The gc:v2 option is removed.

  • The threads:on option becomes the default.

Standard library additions and changes

  • macros.parseExpr and macros.parseStmt now accept an optional. filename argument for more informative errors.
  • Module colors expanded with missing colors from the CSS color standard.
  • Fixed lists.SinglyLinkedList being broken after removing the last node (#19353).
  • md5 now works at compile time and in JavaScript.
  • std/smtp sends ehlo first. If the mail server does not understand, it sends helo as a fallback.
  • Changed mimedb to use an OrderedTable instead of OrderedTableRef, to use it in a const.
  • strutils.find now use and default to last=-1 for whole string searches, making limiting it to just the first char (last=0) valid.
  • random.rand now works with Ordinals.
  • Added IsoWeekRange, a range type to represent the number of weeks in an ISO week-based year.
  • Added IsoYear, a distinct int type to prevent bugs from confusing the week-based year and the regular year.
  • Added initDateTime in times to create a datetime from a weekday, and ISO 8601 week number and week-based year.
  • Added getIsoWeekAndYear in times to get an ISO week number along with the corresponding ISO week-based year from a datetime.
  • Added getIsoWeeksInYear in times to return the number of weeks in an ISO week-based year.
  • Added std/oserrors for OS error reporting. Added std/envvars for environment variables handling.
  • Added sep parameter in std/uri to specify the query separator.
  • Added Array.shift for JavaScript targets.
  • Added queueMicrotask for JavaScript targets.
  • Deprecated selfExe for Nimscript.
  • Removed deprecated oids.oidToString.
  • Removed define nimExperimentalAsyncjsThen for std/asyncjs.then and std/jsfetch.
  • Removed deprecated jsre.test and jsre.toString.
  • Removed deprecated math.c_frexp.
  • Removed deprecated httpcore.`==`.
  • Removed deprecated std/dom_extensions.
  • Removed deprecated std/posix.CMSG_SPACE and std/posix.CMSG_LEN that takes wrong argument types.
  • Removed deprecated osproc.poDemon, symbol with typo.

Language changes

  • Case statement macros are no longer experimental, meaning you no longer need to enable the experimental switch caseStmtMacros to use them.

  • Templates now accept macro pragmas.

  • Macro pragmas for var/let/const sections have been redesigned in a way that works similarly to routine macro pragmas. The new behavior is documented in the experimental manual.

  • Pragma macros on type definitions can now return nnkTypeSection nodes as well as nnkTypeDef, allowing multiple type definitions to be injected in place of the original type definition.

    import macros

macro multiply(amount: static int, s: untyped): untyped =
  let name = $s[0].basename
  result = newNimNode(nnkTypeSection)
  for i in 1 .. amount:
    result.add(newTree(nnkTypeDef, ident(name & $i), s[1], s[2]))

type
  Foo = object
  Bar {.multiply: 3.} = object
    x, y, z: int
  Baz = object

# becomes

type
  Foo = object
  Bar1 = object
    x, y, z: int
  Bar2 = object
    x, y, z: int
  Bar3 = object
    x, y, z: int
  Baz = object

  • Full command syntax and block arguments i.e. foo a, b: c are now allowed for the right-hand side of type definitions in type sections. Previously they would error with "invalid indentation".

  • defined now accepts identifiers separated by dots, i.e. defined(a.b.c). In the command line, this is defined as -d:a.b.c. Older versions can use accents as in defined(`a.b.c`) to access such defines.

  • Defines the gcRefc symbol which allows writing specific code for the refc GC.

Compiler changes

  • nim can now compile version 1.4.0 as follows: nim c --lib:lib --stylecheck:off compiler/nim, without requiring -d:nimVersion140 which is now a noop.

  • --styleCheck now only applies to the current package.

Tool changes

  • The gc switch has been renamed to mm ("memory management") in order to reflect the reality better. (Nim moved away from all techniques based on "tracing".)

  • Nim now supports Nimble version 0.14 which added support for lock-files. This is done by a simple configuration change setting that you can do yourself too. In $nim/config/nim.cfg replace pkgs by pkgs2.

  • There is a new switch --nimMainPrefix:prefix to influence the NimMain that the compiler produces. This is particularly useful for generating static libraries.