Nim Programming Language

Nim version 2.2.10 released

Fri, 24 Apr 2026 00:00:00 +0000

The Nim Team is happy to announce version 2.2.10, the fifth patch release for our stable release, Nim 2.2.

It comes two months after the 2.2.8 release and it contains 76 commits, bringing bugfixes and improvements.

If you’re still on Nim 1.6, take a look at the version 2.0 release article to see all the features you’re missing. If you’ve been using Nim 2.0, the version 2.2 release article shows the improvements available in Nim 2.2.

The Nim 2.2.10 changelog is available here.

NimConf 2026

We would like to remind you about NimConf 2026. If you have anything you would like to share with the Nim community, you have two more weeks (until May 10th) to submit your talk proposal. More details available here.

Installing Nim 2.2.10

Check out if the package manager of your OS already ships version 2.2.10 or install it as described here.

If you have installed a previous version of Nim using choosenim, getting Nim 2.2.10 is as easy as:

$ choosenim update self
$ choosenim update stable

NOTE: We recommend that you install and use the latest version of choosenim, v0.8.16, available in our choosenim repo.

Alternatively, you can download Nim 2.2.10 from our nightlies builds.

Bugfixes

Fixed “new doesn’t work with ref object” (#25005)
Fixed “Switch default mangling back to cpp” (#25338)
Fixed “unhandled exception: field 'sym' is not accessible with type W[N] = seq[tuple[b: N]]” (#25509)
Fixed “proc f(x: static[auto]) doesn’t treat x as static” (#21281)
Fixed “Invalid codegen for accessing tuple in array” (#25553)
Fixed “proc v[T: typedesc]() = discard / v[0]() compiles even though 0 isn’t a typedesc” (#25262)
Fixed “ICE evaluating closure iter with object conversion” (#25572)
Fixed “Regression from v2.2.6 to v2.2.8 and also devel in refc {.align.} pragma where each 16-byte-aligned heap objects gets its own page” (#25566)
Fixed “Nim v2.2.x ORC adds extra nimZeroMem/nimCopyMem/stack usage over refc” (#25552)
Fixed “Regression from 2.0 to version-2-2/devel with refc, LTO and -fstack-usage” (#24746)
Fixed “internal error: getTypeDescAux(tyVoid) with either discard default(tuple[b: void]) or discard default((void,))” (#25508)
Fixed “parseFloat/parseBiggestFloat lose sign of -NaN (signbit is negative)” (#25597)
Fixed “ARC/ORC SIGSEGV with captured variables and closure iterators in reset/nimDecRefIsLastCyclicStatic” (#25596)
Fixed “discard mapIt([0], 0) results in lib/pure/collections/sequtils.nim(1095, 11) Hint: 'it' is declared but not used [XDeclaredButNotUsed]” (#25626)
Fixed “proc r(_: typedesc, _: static uint | static int) = discard; r(uint, 0) causes cannot generate code for: mStatic” (#25642)
Fixed “two overflowed *= causes program deadloop sysFatal on –exceptions:goto” (#25658)
Fixed “commands: –maxLoopIterationsVM validation used wrong condition (not/bind precedence)” (#25671)
Fixed “docgen: cmpDecimalsIgnoreCase uses wrong index in max() for digit window” (#25670)
Fixed “parsecfg: IndexDefect in replace() when value ends with ‘\c’” (#25674)
Fixed “Regression: object with self-referential lent proc field fails to compile” (#25677)
Fixed “proc g() {.exportc, error: "".} = (; let a = 0) causes Error: internal error: expr(nkIdent); unknown node kind” (#25632)
Fixed “Doc comment makes nimvm ignore assignment through template” (#25682)
Fixed “orc: seq assignment slow” (#25687)
Fixed “Regression from v2.2.6 to v2.2.8 and also devel in refc {.align.} pragma where each 32-byte-aligned heap objects gets its own page” (#25577)
Fixed “nimsuggest –v3 and –v4 “outline” output does not list methods” (#25710)
Fixed “{.borrow.} on iterator for distinct seq triggers internal error” (#25697)
Fixed “template with overload redefines proc” (#25290)
Fixed “Invalid C code generation with iterator/nimvm” (#25724)
Fixed “std/parseopt no longer support - when shortNoVal is given” (#25738)
Fixed “Using sum types with module specifiers typechecks inconsistently” (#18095)
Fixed “Conversion from distinct in for forces a copy of underlying instance” (#25469)
Fixed “static: (for f in [0]: discard a.b == f) causes nim check unhandled exception: field 'intVal' is not accessible for type 'TFullReg' using 'kind = rkNone' [FieldDefect]” (#25732)
Fixed “JS backend crashes when returning Option[T] with custom =destroy” (#25751)
Fixed “setLenUnit slow, actually initializes seq (refc)” (#25718)
Fixed “Stack overflow/materialization-based segfault in refc and ORC with large object initialization and heap assignment” (#25695)

The complete list of changes is available here.

NimConf 2026: Dates Announced, Registrations Open

Tue, 07 Apr 2026 00:00:00 +0000

The Nim Team is happy to announce the next instalment of NimConf! NimConf 2026 will happen June 20, 2026 in the traditional online format where the talks are pre-recorded and revealed as premiers on YouTube while the viewers can ask questions and the presenter can answer them in the live chat.

If you have anything to share with the Nim community, submit your talk proposal before May 10, 2026.

The moderators will contact you if your talk is accepted and you’ll have time until June 7, 2026 to record and submit your talk.

If you are unsure if your topic fits with the NimConf format, please do submit it anyway: the Nim community is generally open to learn about anything Nim-related from pet project showcases to niche libraries and business usecases.

What is NimConf?

NimConf is an online community event all about the Nim programming language: language development, its ecosystem, projects created with Nim, business cases enabled with Nim, and so on. Basically, anything Nim-related is a legit topic for a talk.

For viewers, it’s a great opportunity to learn about the latest Nim development progress, discover new areas to use Nim for, improve your Nim expertise, and exchange experience with other Nim enthusiasts.

For presenters, NimConf is an opportunity to reach out to new audiences, promote your work, collect feedback, and build the community.

You can see all the talks from previous years on YouTube:

Important Dates

Talk proposals are accepted until May 10, 2026.
Talk recordings must be submitted before June 7, 2026.
NimConf 2026 will be held on June 20, 2026.

Nim version 2.2.8 released

Mon, 23 Feb 2026 00:00:00 +0000

The Nim Team is happy to announce version 2.2.8, the fourth patch release for our stable release, Nim 2.2.

It comes four months after the 2.2.6 release and it contains 89 commits, bringing bugfixes and improvements.

The Nim 2.2.8 changelog is available here.

Highlights

We think that for everyday users the most impactful bugfix is that for heavily multi-threaded code the default allocator is now much more stable. The days where the workaround -d:useMalloc is required might be beyond us. Please give us feedback!

Installing Nim 2.2.8

Check out if the package manager of your OS already ships version 2.2.8 or install it as described here.

If you have installed a previous version of Nim using choosenim, getting Nim 2.2.8 is as easy as:

$ choosenim update self
$ choosenim update stable

NOTE: We recommend you to install and use the latest version of choosenim, v.0.8.16, available in our choosenim repo.

Alternatively, you can download Nim 2.2.8 from our nightlies builds.

Bugfixes

Fixed “Unexpected ambiguous call with fields over object with default fields” (#25252)
Fixed “C++ styled name mangling must be opt-in via a different switch than –debuginfo” (#25263)
Fixed “Regression in 2.2.6: SIGBUS with iterator over const Table lookup - premature temporary destruction” (#25251)
Fixed “Unable to build Nim 2.2.6 tools from source” (#25265)
Fixed “std/unicode.strip trailing fails on some characters” (#19846)
Fixed “Regression: .global initialization inside method hoisted to preInitProc without temporary variable declarations (invalid C codegen)” (#25284)
Fixed “passing tuple with items defined as concept (UserDefinedClass) causes compiler crash” (#25227)
Fixed “setLen slow when shrinking seq due to zero-filling of released area” (#19728)
Fixed “setLenUninit missing for --mm:refc” (#25007)
Fixed “Term rewriting stops processing on long files” (#25304)
Fixed “SIGSEGV regression from Nim v2.2.4 to v2.2.6/devel with closure iteratures” (#25261)
Fixed “Combination of generic destructor and closure fails in certain cases” (#22305)
Fixed “Channel incorrectly takes a sink argument, when in fact it performs a deep copy internally” (#25324)
Fixed “Dangling pointers in stack traces with -d:nimStackTraceOverride” (#25306)
Fixed “Closure iterator swallows finally body when it contains try..except. Regression in 2.2.6/devel” (#25330)
Fixed “Invalid m_type access in hooks for distinct generic types under ARC/ORC/HOOKS/ATOMICARC” (#25341)
Fixed “Wrong type for second parameter of procedures “inc”, “dec”, “succ” and “pred”” (#25329)
Fixed “Regression from v2.2.6 to version-2-2/devel with importing let u {.global.} = default(ref int)” (#25369)
Fixed “[Concepts] Recursive concepts cause a compiler segfault when testing with is” (#17630)
Fixed “httpclient generates bad HTTPS requests through HTTP proxy” (#25319)
Fixed “Invalid pred in when swallowed” (#25254)
Fixed “Nim comment text + embedsrc breaks C codegen” (#25387)
Fixed “Hooks do not work for specific instances of static generic objects” (#23394)
Fixed “shl causes undefined behaviour” (#19983)
Fixed “Error: fatal error: invalid kind for lastOrd(tyNone) with type M = set” (#25419)
Fixed “Naked raised causes wrong exception effect” (#25400)
Fixed “unhandled exception: field ‘intVal’ is not accessible for type ‘TNode’ using ‘kind = nkNilLit’ [FieldDefect] with static: discard castpointer” (#25446)
Fixed “Long integer literal truncated without warning” (#25074)
Fixed “add --styleCheck:warn” (#19831)
Fixed “SIGSEGV when trying to compile generic + void-type + typeclass combo” (#25441)
Fixed “Crash when compiling invalid generic instantiation” (#25231)
Fixed “SIGSEGV in refc with distinct types and assign to heap-allocated object” (#25459)
Fixed “Warn on implicit range downsizing” (#24706)
Fixed “ICE leaking temporary 3 slotTempInt” (#25482)
Fixed “Computed types violate isa transitivity” (#25340)
Fixed “Strings can be compared against nil” (#25488)
Fixed “Crash on enum ranges as default parameters in generic procs” (#25494)
Fixed “align not respected in refc, leading to SIGSEGV” (#25457)
Fixed “Invalid C code generation with seq[array[...]]” (#25475)

Nim version 2.2.6 released

Fri, 31 Oct 2025 00:00:00 +0000

The Nim Team is happy to announce version 2.2.6, the third patch release for our stable release, Nim 2.2.

It comes six months after the 2.2.4 release and it contains 141 commits, bringing bugfixes and improvements.

The Nim 2.2.6 changelog is available here.

Highlights

Exception handling combined with Nim’s async is more stable than ever before as the underlying closure iterator transformation has been rewritten.

The compiler is now smart enough to produce a move operation for return obj.field. Previously it performed a copy. Expect your code to run slightly faster due to this and other minor performance improvements.

Installing Nim 2.2.6

Check out if the package manager of your OS already ships version 2.2.6 or install it as described here.

If you have installed a previous version of Nim using choosenim, getting Nim 2.2.6 is as easy as:

$ choosenim update self
$ choosenim update stable

NOTE: We recommend you to install and use the latest version of choosenim, v.0.8.16, available in our choosenim repo.

Alternatively, you can download Nim 2.2.6 from our nightlies builds.

Bugfixes

Fixed “=destroy for non-var failed to compile when JS” (#24914)
Fixed “{.push raises: [].} doesn’t respect lexical scoping” (#23355)
Fixed “Pragma block disabling warning has effect beyond block” (#21975)
Fixed “missing < (less than), cmp for cstring” (#24941)
Fixed “[GC] Illegal storage access when collecting cycle” (#4851)
Fixed “Globals in proc with static params end up being re-initialized” (#24940)
Fixed “Constructor to global variable in converter generates illegal c code” (#4594)
Fixed “Compile-time regression from v2.2.4 to version-2-2/devel with global variable with unhandled exception: iterators.nim(254, 11) len(a) == L the length of the seq changed while iterating over it [AssertionDefect]” (#24981)
Fixed “SIGSEGV when raising Defect/doAssert” (#24974)
Fixed “Crash on marking destroy hook as .error” (#24996)
Fixed “hasCustomPragma stops working after typedesc is copied” (#23564)
Fixed “Asyncnet accept leaks socket on SSL error; Regression in devel” (#25023)
Fixed “SIGSEGV in closure iterator with try/except not at top level” (#21235)
Fixed “Regression from v2.2.4 to version-2-2/devel with closure iterator” (#25038)
Fixed “fixes #24997; {.global.} variable in recursive function” (#25016)
Fixed “concept param passed to varargs causes internal error: genTypeInfo(tyUserTypeClassInst) when JS backend” (#25043)
Fixed “Bad order of destruction” (#24719)
Fixed “Floats are not range checked” (#7179)
Fixed “typo in docs” (#25084)
Fixed “Regression from Nim v2.2.2 to v2.2.4/version-2-2/devel in nim cpp with compatible types not keeping L-valueness” (#25109)
Fixed “FieldDefect compiler crash when comparing pointers at compile time” (#25066)
Fixed “Slow compilation due to vmgen.sameConstant and memory allocations” (#25114)
Fixed “unhandled exception: field 'sym' is not accessible for type 'TNode' using 'kind = nkEmpty' [FieldDefect] with iterator-loop” (#25121)
Fixed “strutils.formatSize returns wrong values from large values close to int64.high” (#25125)
Fixed “Dereferencing result of cast in single expression triggers unnecessary copy” (#24093)
Fixed “internal error: '=destroy' operator not found for type NimNode returning NimNode” (#25120)
Fixed “requiresInit not checked for result if it has been used (2.2 regression)” (#25117)
Fixed “filterIt wrongly results in rvalue” (#25078)
Fixed “@ extremely slow for trivial types” (#25063)
Fixed “withValue for immut tab wrong chk cond” (#25162)
Fixed “Invalid C codegen refc with generic types containing gc memory” (#24844)
Fixed “SinglyLinkedList.remove broken / AssertionDefect” (#25173)
Fixed “error: ‘T2_’ undeclared and error: incompatible types when assigning to type ‘void *’” (#24361)
Fixed “Noncopyable base type ignored” (#24760)
Fixed “lent string generic field isn’t preserving its value” (#25127)
Fixed “cannot return lent expression from conditionals like case” (#23949)
Fixed “Error: internal error: proc has no result symbol” (#21476)
Fixed “Invalid codegen / dangling pointer for openArray escaping from block” (#24261)
Fixed “lib/system/iterators.nim(250, 14) Error: internal error: genArrayLen()” (#25167)
Fixed “Error: unhandled exception: field 'sym' is not accessible for type 'TNode'” (#21138)
Fixed “error: ‘pthread_mutex_t’ has no member named ‘abi’ in refc with reset/{.exportc.}” (#25205)
Fixed “Uninitialized variable usage in resize__system_u... in @psystem.nim.c in ORC” (#25204)
Fixed “VM error when passing object field ref to proc(var T): var T” (#25210)
Fixed “Closure environement wrongly marked as cyclic (orc)” (#25048)
Fixed “Infinite loop with anonymous iterator” (#25046)
Fixed “JS: cast[char](i) for i > 255 not truncate” (#25222)
Fixed “VM issue with globals and assignments” (#25208)
Fixed “Case object from compileTime proc unable to be passed as static param” (#25123)
Fixed “VM repr raises RangeDefect for long string under refc” (#25226)
Fixed “Broken assignment of union with bool inside variant object” (#25236)
Fixed “deques: Deque items behavior is not the same on 2.0.16 and 2.2.0” (#25240)
Fixed “nim doc uses doc comment from private field for public field” (#25027)
Fixed “Compiler internal error compiler/vmgen.nim(1771, 23) with static overload” (#25008)
Fixed “Wrong exception raised wrapped in finally in closure iterator; Regression in devel/version-2-2” (#25202)

The complete list of changes is available here.

Nim versions 2.2.4 and 2.0.16 released

Tue, 22 Apr 2025 00:00:00 +0000

The Nim Team is happy to announce two releases:

version 2.2.4, a second patch release for the latest stable version
version 2.0.16, an eight patch release for Nim 2.0

Nim v2.2.4 comes two and a half months after the v2.2.2 release and it contains 108 commits bringing bugfixes and improvements.

If you’re still using Nim v2.0, the v2.0.16 release brings 31 commits with bugfixes. But we would encourage you to switch to Nim v2.2, as it brings significant improvements to the ORC memory management and to the language and the compiler overall.
Here is the version 2.2 release article, showing the improvements available in Nim 2.2.

The Nim 2.2.4 changelog is available here.

Installing Nim 2.2.4

Check out if the package manager of your OS already ships version 2.2.4 or install it as described here.

If you have installed a previous version of Nim using choosenim, getting Nim 2.2.4 is as easy as:

$ choosenim update self
$ choosenim update stable

NOTE: Make sure that the version of choosenim you have installed is 0.8.5 or higher, otherwise visit choosenim’s repo and see there how to re-install it first, before updating Nim.

Alternatively, you can download Nim 2.2.4 from our nightlies builds.

Bugfixes

Nim 2.2.4

Fixed “A “divmod” call fails to compile with operands whose types have a non negative lower bound.” (#24673)
Fixed “Adding a string to itself causes the resulting length to be off by one” (#24664)
Fixed “Invalid =sink generated for pure inheritable object” (#24725)
Fixed “Mangling wrong for static parameters” (#24705)
Fixed “Error: identifier expected, but found '(0, 0)[0]' with let _ = in for _ in r.fields” (#24339)
Fixed “{.gcsafe.} block breaks move analysis” (#24754)
Fixed “Thread local not registed as GC root when =destroy exists (refc)” (#24770)
Fixed “sign of NaN differs in CT & RT” (#24772)
Fixed “setjmp on linux mangles ebp leading to early collection” (#10625)
Fixed “Invalid C code generation in ORC with methods, a case object, and std/options” (#24801)
Fixed “weird SIGSEV with scopes and seqs” (#24806)
Fixed “macro-generated if/else and when/else statements have mismatched indentation with repr” (#24850)
Fixed “cross-module sink analysis broken” (#24764)
Fixed “Data getting wiped on copy with iterators and =copy on refc” (#24879)
Fixed “build_all.sh koch tools fails to build atlas” (#24881)
Fixed “doc: export for imported symbols are not generated document.” (#24890)

The complete list of changes is available here.

Nim 2.0.16

Fixed “static openArray backed by seq cannot be passed to another function” (#24630)
Fixed “size pragma on type used in type imported indirectly results in inconsistent C declarations of type size” (#24623)
Fixed “Bad codegen when casting procs” (#5901)
Fixed “Copy hook causes an incompatible-pointer-types warning/error in GCC 14 with subclassed objects” (#24147)
Fixed “Thread local not registed as GC root when =destroy exists (refc)” (#24770)
Fixed “setjmp on linux mangles ebp leading to early collection” (#10625)
Fixed “Invalid C code generation in ORC with methods, a case object, and std/options” (#24801)
Fixed “macro-generated if/else and when/else statements have mismatched indentation with repr” (#24850)

The complete list of changes is available here.

Nim version 2.2.2 released

Wed, 05 Feb 2025 00:00:00 +0000

The Nim Team is happy to announce version 2.2.2, the first patch release for our stable release, Nim 2.2.

It comes four months after the 2.2.0 release and it contains 203 commits, bringing bugfixes and improvements.

The Nim 2.2.2 changelog is available here.

Installing Nim 2.2.2

Check out if the package manager of your OS already ships version 2.2.2 or install it as described here.

If you have installed a previous version of Nim using choosenim, getting Nim 2.2.2 is as easy as:

$ choosenim update self
$ choosenim update stable

NOTE: Make sure that the version of choosenim you have installed is 0.8.5 or higher, otherwise visit choosenim’s repo and see there how to re-install it first, before updating Nim.

Alternatively, you can download Nim 2.2.2 from our nightlies builds.

Bugfixes

Fixed “compiler crash on len of varargs[untyped]” (#24258)
Fixed “Force compiler generate declaration of a type” (#19585)
Fixed “importc types alias doesn’t work with distinct” (#18896)
Fixed “Seg fault when adding deque element” (#24319)
Fixed “Nested iterator doesn’t work in proc” (#3824)
Fixed “internal error: not part of closure object type” (#19984)
Fixed “Size/Signedness issues with unordered enums” (#23952)
Fixed “Calling proc with nested ref/deref constructed object results in invalid generated code” (#18081)
Fixed “Error: VM problem: dest register is not set with const-bound proc” (#24359)
Fixed “C compiler error when default initializing an object field function when the default function is overloaded” (#23545)
Fixed “SIGSEGV with nim c -c and nim e on macro w(): untyped = result = genSym(nskType)” (#24379)
Fixed “build failed for lib/pure/selectors via mingw” (#24371)
Fixed “supportsCopyMem can fail from macro context with tuples” (#24378)
Fixed “Stop writing .ndi files” (#24395)
Fixed “Array field that has array-element type with copy-protector and default value set on a field will yield error” (#24369)
Fixed “Memory leak under Arc/Orc on inline iterators with nested seq.” (#24402)
Fixed “new-style concept fails to match” (#24451)
Fixed “No error checking on fclose” (#19600)
Fixed “let symbol created by template is reused in nimvm branch “ (#24472)
Fixed “redundant type cast causes errors with VCC” (#24476)
Fixed “asyncdispatch.drain returns before timeout even if there are pending operations” (#24506)
Fixed “ensureMove usage leading to memory leak for JsonNode !” (#24504)
Fixed “UB calling allocCStringArray([""]) with --mm:refc” (#22153)
Fixed “std/pegs with nim cpp --mm:orc --exceptions:goto creates invalid C++” (#22101)
Fixed “Word error” (#24538)
Fixed “Allow, but warn on, unknown hint/warning names” (#20908)
Fixed “building nimble 0.16.4 fails when running build_all.sh” (#24536)
Fixed “The compiler optimizes out unused constants marked with the exportc pragma” (#17681)
Fixed “Asyncdispatch leaks under –mm:arc” (#23212)
Fixed “Nim v2 emit / asm var param dereference inconsistency” (#23114)
Fixed “Incorrect/misleading error message with large array bounds” (#24599)
Fixed “static openArray backed by seq cannot be passed to another function” (#24630)
Fixed “size pragma on type used in type imported indirectly results in inconsistent C declarations of type size” (#24623)
Fixed “nimsuggest “outline” output does not list templates” (#21923)
Fixed “cpp compilation failure on Nim 2.2.x.” (#24658)

The complete list of changes is available here.

Nim Community Survey 2024 Results

Thu, 23 Jan 2025 00:00:00 +0000

The Nim community survey 2024 has been open for two months, and we have received 367 responses – less than in previous years, but we’ll still try to draw conclusions about our users and their habits. Before we go into details, we would like to thank all the people who took the time to respond. We really appreciate the feedback!

The goal of this survey was primarily to determine how our community is using Nim, in order to better understand how we should be improving it.

Do you use Nim?

Based on the answer to this question, the respondents were divided into two groups that each received a separate set of questions.

Approximately three quarters of the respondents use Nim (40% frequently, 36% occasionally), while the remaining quarter is divided between people who never used Nim (7%) and people who stopped using Nim (17%).

Of those people who don’t use Nim, the most frequent reasons are: “Nim seems immature, not ready for production”, “Nim doesn’t have libraries I need”,”Nim doesn’t have enough learning materials”, and “Nim seems too risky for production”, in that order.

Users

Compared to the response from last year, our user-base has more Nim experience than before. With 57% of users who are using Nim for at least two years and only 15% new users (using Nim less than a year), it seems that we’re not attracting enough new users.

A typical Nim user, just as in previous years, would be a software developer from Europe.

Besides Europe (more than half of our users), our users mostly come from North America and Asia. We see a slight decline of software developers (41% vs 49% last year), while there is an increase of freelancers and business owners.

We have users from all age groups and all levels of programming experience, proving that Nim can be used both by beginners and veteran programmers.

Similar to last year, 33% Nim users are older than 40, 18% younger than 24. The experience is also similar to last year: 55% users having at least 10 years of experience and just 6% users with less than 2 years of experience.

Same as previously, things that people like about Nim the most are: performance/speed and syntax, syntax, ease of use, and self-contained binaries.

VS Code continues to dominate. In the second place is Vim/Neovim, followed by Sublime Text, Emacs and IntelliJ.

Nim versions

We’re glad to see that the large majority of users are using the latest stable version (2.2.x).

We can partially attribute this to the mostly painless upgrade process:

Using Nim

The upward trend started the last year is continuing – more than 28% of our respondents use Nim for the majority of time (60% or more), which is a 40% increase from last year’s 20% (and it was just 16% the year before).

Although the numbers are low, we are seeing an upward trend: slightly more users are using Nim at work than previously.

The change from 2023 responses is that embedded is now ahead of JavaScript.

Learning Nim

This year we only wanted to see the responses of Nim-newcomers, to see what learning materials are still “fresh” and still used in 2024, but from the amount of responses we see that even some our more experienced users answered this question :)

The most popular learning resource are the official tutorials, followed by “Nim by Example”. “Nim Basics” is in the third place, surpassing “Nim in Action” and “Mastering Nim” books. Rosetta Code examples is also a popular choice as a learning resource

Just like in the previous survey, the most wanted types of learning materials are code examples and written tutorials.

If someone in our community is willing to work on Nim, but has no idea what to do, these tutorials would be a good start.

Nim in 2025 and beyond

Each year improving the tooling is getting more and more votes, and this year it has become the top priority to fix, according to our users.

Thanks to our partnership with Status, it is one of our main priorities for 2025.

Similar to the last year, 2/3 of our users find it very important to work on the compiler bugs. We will continue to work on it, and we appreciate any community effort on this: we already have several individuals continuously helping us with fixing compiler bugs (thank you!), and we’d benefit from more.

These results are slightly better than last year (documentation 2021, learning materials 2021). When it comes to learning materials, where we mostly lean on the community content (for this to improve we need your involvement!), people want to see more written tutorials and code examples.

Last words

Thank you to each and every one of you who took the time to answer this survey. Your time is precious and we are deeply thankful that you used it to share your feedback.

Please remember that you do not need to wait for a survey in order to give us feedback; of course you’re more than welcome to wait if you wish, but ideally share your feedback with us immediately. We can be found in various places - see the community page for links and instructions on how to get in touch.

If you would like to help us in our 2025 plans, consider contributing or making a donation. You can donate via Open Collective.

If you are a company, we also offer commercial support. Please get in touch with us via support@nim-lang.org. As a commercial backer, you can decide what features and bugfixes should be prioritized.

Nim version 2.0.14 released

Tue, 24 Dec 2024 00:00:00 +0000

The Nim team is happy to announce Nim version 2.0.14, our seventh patch release for Nim 2.0, for our users who haven’t switched yet to Nim 2.2.

Version 2.0.14 contains 40 commits, and it brings several improvements to Nim 2.0.12, released two months ago.

Installing Nim 2.0.14

If you have installed a previous version of Nim using choosenim, getting Nim 2.0.14 is as easy as:

$ choosenim update self
$ choosenim 2.0.14

Make sure that the version of choosenim you have installed is 0.8.5 or higher, otherwise visit choosenim’s repo and see there how to re-install it first, before updating Nim.

Alternatively, you can download Nim 2.0.14 from our nightlies builds.

Nim Community Survey 2024

We would like to remind you about Nim Community Survey.

If you haven’t participated yet, now’s the time. It shouldn’t take more than 5 minutes, and it helps us to make Nim better.

Bugfixes

These reported issues were fixed:

Fixed “ensureMove usage leading to memory leak for JsonNode !” (#24504)
Fixed “UB calling allocCStringArray([""]) with --mm:refc” (#22153)
Fixed “Regression when using generic type with Table/OrderedTable” (#23233)
Fixed “Wrong C code generated for newSeqWith when initializing two variables” (#18104)
Fixed “Wrong behaviour when wrapping a constant object variant into a sequence at runtime” (#23295)
Fixed “Invalid C code generated for lent array in tuple” (#24034)
Fixed “Seg fault when adding deque element” (#24319)
Fixed “C compiler error when default initializing an object field function when the default function is overloaded” (#23545)
Fixed “build failed for lib/pure/selectors via mingw” (#24371)
Fixed “Calling proc with nested ref/deref constructed object results in invalid generated code” (#18081)
Fixed “let symbol created by template is reused in nimvm branch “ (#24472)
Fixed “building nimble 0.16.4 fails when running build_all.sh” (#24536)

The complete list of changes is available here.

Launching the 2024 Nim Community Survey

Mon, 09 Dec 2024 00:00:00 +0000

We are proud to announce the launch of the official 2024 Nim Community Survey!

No matter whether you use Nim today, have used Nim previously, or never used Nim before; we want to know your opinions. Your feedback will help the Nim project understand its strengths and weaknesses, and to determine development priorities for the future.

Answer Survey

It shouldn’t take you much longer than 5 minutes to complete this survey. Submissions will be accepted until the start of 2025, depending on the response rates. If you have any questions or feedback, please don’t hesitate to get in touch with us via email at survey@nim-lang.org or on the Nim Forum.

This is now the eight year in which this survey has been running. An analysis of the results for the past years can be found at the following links:

We would appreciate your help in spreading the word about this survey. Share the Google Forms link on your social network feeds, with your colleagues and in other communities.

Once the submission period ends, the results will be shown here and publicized via the Nim Forum.

Thanks for your time!

Nim version 2.0.12 released

Fri, 01 Nov 2024 00:00:00 +0000

The Nim team is happy to announce Nim version 2.0.12, our sixth patch release for Nim 2.0, for our users who haven’t switched yet to Nim 2.2.

Version 2.0.12 is a small release, containing just 24 commits, but it brings several improvements to Nim 2.0.10, released a month ago.

Installing Nim 2.0.12

If you have installed a previous version of Nim using choosenim, getting Nim 2.0.12 is as easy as:

$ choosenim update self
$ choosenim 2.0.12

Make sure that the version of choosenim you have installed is 0.8.5 or higher, otherwise visit choosenim’s repo and see there how to re-install it first, before updating Nim.

Alternatively, you can download Nim 2.0.12 from our nightlies builds.

Donating to Nim

We would like to encourage you to donate to Nim. The donated money will be used to further improve Nim by creating bounties for the most important bugfixes and features.

You can donate via:

Open Collective
Bitcoin: 1BXfuKM2uvoD6mbx4g5xM3eQhLzkCK77tJ

If you are a company, we also offer commercial support.

Bugfixes

These reported issues were fixed:

Fixed “dist/checksums wrong type: preventing build_all.sh” (#24173)
Fixed “Regression: compiler crash on static inference” (#23755)
Fixed “Regression: Error: fatal error: invalid kind for lastOrd(tyGenericParam)” (#23823)
Fixed “compiler crash on len of varargs[untyped]” (#24258)
Fixed “Error: VM problem: dest register is not set with const-bound proc” (#24359)
Fixed “Returning address of constant array emits invalid C code” (#22389)
Fixed “SIGSEGV with nim c -c and nim e on macro w(): untyped = result = genSym(nskType)” (#24379)

The complete list of changes is available here.