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ringabout a28e450154 fixes #25851; ensure --panics:on does not skip nimErr_ check after closure calls (#25855) 
fixes #25851

## Summary: `--panics:on` drops `nimErr_` check after closure calls
(#25851)

### Bug

With `--exceptions:goto` and `--panics:on`, the compiler skipped the
`nimErr_` check after indirect closure calls whose result flows directly
into another call (e.g., `result.add elem(src)`). A raise inside the
closure was silently swallowed — the loop continued, and the next
`raise` hit the already-set `nimInErrorMode` flag, overflowing its
`bool` storage into `OverflowDefect`.

### Root Cause

**ast.nim** — `canRaise` checked `fn.typ.n[0].len < effectListLen` first
(false after the expansion) and then `exceptionEffects != nil` (also
false, nil), so it returned `false` — meaning "cannot raise." The C
codegen trusted this and omitted the `nimErr_` check.

### Fix

**ast.nim** — `canRaise` now treats `nil` `exceptionEffects` as "unknown
→ can raise" (`exceptionEffects == nil` as an additional true
condition). This is defense-in-depth: even if some other path expands
the list but leaves `exceptionEffects` nil (e.g., a type with `{.tags.}`
but no `{.raises.}`), the error check is still emitted.

### Test

tclosure_err_panic_goto.nim — exercises the double-trigger pattern
(`drawBool` sets the error flag → closure call must propagate it) with
`matrix: "; --panics:on"` covering both exception modes.

(cherry picked from commit 88a18de44f)
2026-06-08 08:46:56 +02:00
..
ic
make PNode.typ a private field (#24326)
2025-01-14 07:46:40 +01:00
plugins
Adds support for custom ASTs in the Nim parser (#23417)
2024-03-18 20:27:00 +01:00
aliasanalysis.nim
use strictdefs for compiler (#22365)
2023-08-06 14:26:21 +02:00
aliases.nim
type refactor: part 4 (#23077)
2023-12-15 10:20:57 +01:00
ast.nim
fixes #25851; ensure --panics:on does not skip nimErr_ check after closure calls (#25855)
2026-06-08 08:46:56 +02:00
astalgo.nim
bring back id table algorithm instead of std table [backport:2.2] (#24930)
2025-05-06 16:04:43 +02:00
astdef.nim
reduce imports (#25398)
2026-01-09 09:03:51 +01:00
astmsgs.nim
fixes #23494; Wrong type in object construction error message (#23504)
2024-04-16 12:46:59 +02:00
astyaml.nim
refactor: The popular 'r' field is now named 'snippet' (#23829)
2024-07-12 15:23:09 +02:00
bitsets.nim
NIR: Nim intermediate representation (#22777)
2023-10-11 17:44:14 +02:00
btrees.nim
use strictdefs for compiler (#22365)
2023-08-06 14:26:21 +02:00
cbuilder.nim
use cbuilder for tuple/object generation (#24145)
2024-09-27 11:12:39 +02:00
ccgcalls.nim
conv needs to be picky about aliases and introduces a temp for addr conv (#24818)
2025-04-02 09:42:57 +02:00
ccgexprs.nim
fixes #25695 (#25756)
2026-04-20 09:45:51 +02:00
ccgliterals.nim
store full definition AST for consts, fix noRewrite (#20115)
2022-09-28 15:05:01 +02:00
ccgmerge_unused.nim
removed unused sections in codegen (#20976)
2022-11-30 21:51:13 +01:00
ccgreset.nim
fixes #25205 #14873; resets importc obj with nimZeroMem in specializeResetT for refc (#25207)
2025-10-08 08:33:16 +02:00
ccgstmts.nim
fixes ReraiseDefect after typeless except: + finally: (cpp backend) (#25777)
2026-05-29 08:21:52 +02:00
ccgthreadvars.nim
refactor: The popular 'r' field is now named 'snippet' (#23829)
2024-07-12 15:23:09 +02:00
ccgtrav.nim
refactor: The popular 'r' field is now named 'snippet' (#23829)
2024-07-12 15:23:09 +02:00
ccgtypes.nim
fix #25508; ignores void types in the backends (#25550)
2026-03-09 10:47:45 +01:00
ccgutils.nim
Revert "implements internal sink copy (#24747)"
2025-03-18 08:49:45 +01:00
cgen.nim
fixes #25387; embedsrc breaks with Line Continuation (#25388)
2026-01-09 08:49:03 +01:00
cgendata.nim
fixes finally being skipped when except T as e re-raises (cpp backend) (#25775)
2026-05-08 14:55:56 +02:00
cgmeth.nim
make PNode.typ a private field (#24326)
2025-01-14 07:46:40 +01:00
closureiters.nim
fixes #25596 (#25609)
2026-03-17 10:12:06 +01:00
cmdlinehelper.nim
fixes #23429; rework --verbosity with warnings/hints (#23441)
2024-03-28 11:04:12 +01:00
commands.nim
fix: implicit imports drop std/ prefix (#25780)
2026-05-08 15:17:50 +02:00
compiler.nimble
Create compiler and nimsuggest packages (#22118)
2023-06-18 16:06:14 +02:00
concepts.nim
reduce imports (#25398)
2026-01-09 09:03:51 +01:00
condsyms.nim
fixes #24706; Warn on implicit range downsizing (#25451)
2026-02-02 07:59:57 +01:00
debuginfo.nim
happy new year
2017-01-07 22:35:09 +01:00
debugutils.nim
Extend and document compiler debugging utilities (#19841)
2022-06-10 20:40:08 +02:00
depends.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
deps.nim
reduce imports (#25398)
2026-01-09 09:03:51 +01:00
dfa.nim
fixes lastRead uses the when nimvm branch (#24834)
2025-04-02 09:43:12 +02:00
docgen2.nim
use strictdefs for compiler (#22365)
2023-08-06 14:26:21 +02:00
docgen.nim
fixes #25670; docgen: cmpDecimalsIgnoreCase max() used wrong index for b (#25669)
2026-03-30 15:09:59 +02:00
enumtostr.nim
account for invalid data in enum $ on arc/orc (#24886)
2025-04-18 12:50:05 +02:00
errorhandling.nim
IC: progress and refactorings (#22961)
2023-11-20 21:12:13 +01:00
evalffi.nim
make PNode.typ a private field (#24326)
2025-01-14 07:46:40 +01:00
evaltempl.nim
make PNode.typ a private field (#24326)
2025-01-14 07:46:40 +01:00
expanddefaults.nim
remove fauxMatch for tyFromExpr, remove tyProxy and tyUnknown aliases (#24018)
2024-08-28 20:46:36 +02:00
extccomp.nim
Create Mac app bundle for GUI apps on macOS when --app:gui is used (#25042)
2025-07-17 13:39:17 +02:00
filter_tmpl.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
filters.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
gorgeimpl.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
guards.nim
fixes #22791; ProveField warning with nested case object (#25774)
2026-05-28 09:22:36 +02:00
hlo.nim
Fixes #25304 proper test for hlo recursion limit (#25305)
2025-11-22 13:33:01 +01:00
idents.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
importer.nim
fix: implicit imports drop std/ prefix (#25780)
2026-05-08 15:17:50 +02:00
index.nim
walkDirRecFilter, update doc CI filter, compiler/index.nim for docs + various other fixes (#14501)
2020-06-01 19:21:41 +02:00
injectdestructors.nim
fixes #24746 (#25587)
2026-03-09 10:13:31 +01:00
installer.ini
fixes nightlies due to UB errors; increase maxCPU hard limits (#25219)
2025-10-14 11:37:24 +02:00
int128.nim
fixes yet another strictdefs bug (#23069)
2023-12-15 08:13:25 +01:00
isolation_check.nim
docs: fix typos (#24573)
2025-01-15 10:21:20 +01:00
jsgen.nim
fixes #25751; JS backend crashes when returning Option[T] with custom =destroy (#25752)
2026-04-20 09:45:28 +02:00
jstypes.nim
fixes #25043: js tyUserTypeClass internal error (#25044)
2025-07-17 13:39:41 +02:00
lambdalifting.nim
Fix inconsistent env type with nested procs in iterators (#21242) (#25699)
2026-04-07 08:34:55 +02:00
layeredtable.nim
reduce imports (#25398)
2026-01-09 09:03:51 +01:00
layouter.nim
nimpretty: check the rendered AST for wrong output (#23057)
2023-12-13 10:39:10 +01:00
lexer.nim
fixes #25821; unary minus off by one mistake [backport] (#25823)
2026-05-22 08:57:23 +02:00
liftdestructors.nim
fixes #25687; optimizes seq assignment for orc (#25689)
2026-04-03 12:47:11 +02:00
liftlocals.nim
make PNode.typ a private field (#24326)
2025-01-14 07:46:40 +01:00
lineinfos.nim
See discussion at https://github.com/nim-lang/Nim/pull/25602 . (#25612)
2026-03-23 09:10:29 +01:00
linter.nim
fixes #19831; add --styleCheck:warning (#25456)
2026-01-26 09:13:17 +01:00
llstream.nim
repl: support eof, define object with fields (#24784)
2025-03-25 09:44:55 +01:00
lookups.nim
makes DuplicateModuleImport back to an error (#25178)
2025-09-22 08:48:48 +02:00
lowerings.nim
make PNode.typ a private field (#24326)
2025-01-14 07:46:40 +01:00
macrocacheimpl.nim
IC: next steps (#16632)
2021-01-12 09:36:51 +01:00
magicsys.nim
fix compiler crash with uncheckedAssign and range/distinct discrims [backport] (#25585)
2026-03-09 10:13:04 +01:00
main.nim
remove nir; succeeded by nif (#23809)
2024-07-09 09:29:45 +02:00
mangleutils.nim
apply the new mangle algorithm to JS backend for parameters and procs (#23476)
2024-04-05 08:54:48 +02:00
modulegraphs.nim
reduce imports (#25398)
2026-01-09 09:03:51 +01:00
modulepaths.nim
make mangled module names shorter (#24976)
2025-06-06 08:32:58 +02:00
modules.nim
adds a getter/setter for owner (#24318)
2025-01-14 07:45:59 +01:00
msgs.nim
fixes #19831; add --styleCheck:warning (#25456)
2026-01-26 09:13:17 +01:00
nilcheck.nim
make PNode.typ a private field (#24326)
2025-01-14 07:46:40 +01:00
nim.cfg
enable --warning:ImplicitRangeConversion (#25477)
2026-02-26 17:32:51 +01:00
nim.nim
fixes #23848; The comand nim gendepend defaults to ORC (#23851)
2024-07-17 18:25:19 +02:00
nimblecmd.nim
fixes yet another strictdefs bug (#23069)
2023-12-15 08:13:25 +01:00
nimconf.nim
add srcDir variable to nim.cfg (#24919)
2025-10-27 08:51:00 +01:00
nimeval.nim
fixes addr/hiddenAddr in strictdefs (#23477)
2024-04-10 14:41:16 +02:00
nimlexbase.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
nimpaths.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
nimsets.nim
make PNode.typ a private field (#24326)
2025-01-14 07:46:40 +01:00
nodejs.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
nodekinds.nim
opensym as node kind + fixed experimental switch (#23892)
2024-08-12 15:33:26 +02:00
nversion.nim
warn on set types bigger than max size, default to 0..255 for int literals (#21659)
2023-04-17 20:55:22 +02:00
optimizer.nim
fixes #24806; don't elide wasMoved when syms are used in blocks (#24831)
2025-04-04 10:08:30 +02:00
options.nim
fixes #25617; handle backend type aliasing in procParamTypeRel (#25692)
2026-05-29 08:25:50 +02:00
packagehandling.nim
use strictdefs for compiler (#22365)
2023-08-06 14:26:21 +02:00
packages.nim
make linter use lineinfo to check originating package (#24270)
2025-01-14 07:34:32 +01:00
parampatterns.nim
fixes #23949; cannot return lent expression from conditionals like case (#25190)
2025-09-24 08:54:39 +02:00
parser.nim
Improve error message for keywords as parameters (#25052)
2025-07-17 13:39:26 +02:00
passaux.nim
test removing dollar for objects out of system (#20242)
2022-08-24 09:44:16 +02:00
passes.nim
improve passes.nim (#24376)
2025-01-14 07:51:55 +01:00
pathutils.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
patterns.nim
clean up opensym encounters in compiler (#24866)
2025-04-14 10:52:41 +02:00
pipelines.nim
Allow specifiying path to use for stdin error messages (#24595)
2025-04-14 10:52:50 +02:00
pipelineutils.nim
replaces implicit passes array registed at runtime with explicit function calls; simplify compilation pipeline (#21444)
2023-03-03 07:36:38 +01:00
platform.nim
fixes nightlies due to UB errors; increase maxCPU hard limits (#25219)
2025-10-14 11:37:24 +02:00
pluginsupport.nim
refactoring: fewer global variables
2018-05-27 19:19:12 +02:00
pragmas.nim
allow setting arbitrary size for importc types (#24868)
2025-04-14 10:53:01 +02:00
prefixmatches.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
procfind.nim
fixes addr/hiddenAddr in strictdefs (#23477)
2024-04-10 14:41:16 +02:00
pushpoppragmas.nim
fixes push warnings for sempass2 (#23603)
2024-09-03 09:19:52 +02:00
readme.md
clean up the documentation (#22196)
2023-07-02 22:36:05 +02:00
renderer.nim
fixes whitespace related endless loop in renderer.nim (#25750)
2026-04-16 19:44:36 +02:00
renderverbatim.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
reorder.nim
clean up opensym encounters in compiler (#24866)
2025-04-14 10:52:41 +02:00
rodutils.nim
NIR: C codegen additions (#22914)
2023-11-06 18:33:28 +01:00
ropes.nim
replaces doAssert false with raiseAssert for unreachable branches, which works better with strictdefs (#22436)
2023-08-10 14:26:40 +02:00
saturate.nim
fix warnings for deprecated low and high (#15291)
2020-09-11 01:04:07 +02:00
scriptconfig.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
sem.nim
fixes #25008; Compiler internal error with static overload (#25234)
2025-10-28 13:50:50 +01:00
semcall.nim
fixes #25290; tempalte overload scope dupe (#25308)
2026-04-13 12:06:27 +02:00
semdata.nim
fix compiler crash regression with explicit destructor calls [backport:2.2] (#25717)
2026-04-09 18:12:45 +02:00
semexprs.nim
fixes lent tuple codegen error (#25782)
2026-05-08 15:14:04 +02:00
semfields.nim
fixes #24339; underscores used with fields and fieldPairs (#24341)
2025-03-03 14:10:49 +01:00
semfold.nim
fixes #19983; implements bitmasked bitshifting for all backends (#25390)
2026-01-12 08:48:55 +01:00
semgnrc.nim
don't warn/error symbols in semGenericStmt/templates (#24907)
2025-05-05 08:19:11 +02:00
seminst.nim
generally disallow recursive structural types, check proc param types (#24893)
2025-04-21 19:09:45 +02:00
semmacrosanity.nim
fixes #24361 (#25179)
2025-09-22 08:47:23 +02:00
semmagic.nim
fix #25789; improve handling of distinct types (#25791)
2026-05-08 15:07:34 +02:00
semobjconstr.nim
fixes #25123; fixes #11862; Case object from compileTime proc unable to be passed as static param (#25224)
2025-10-17 09:24:11 +02:00
semparallel.nim
make PNode.typ a private field (#24326)
2025-01-14 07:46:40 +01:00
sempass2.nim
fixes #22950; Poor error message on cast effect violation (#25839)
2026-05-28 09:22:27 +02:00
semstmts.nim
fixes #25732; semStaticExpr and semStaticStmt to handle errors (#25742)
2026-04-17 12:03:15 +02:00
semstrictfuncs.nim
alternative, much simpler algorithm for strict func checking (#21066)
2022-12-11 16:58:50 +01:00
semtempl.nim
don't warn/error symbols in semGenericStmt/templates (#24907)
2025-05-05 08:19:11 +02:00
semtypes.nim
fixes #18095 (#25744)
2026-04-15 09:23:21 +02:00
semtypinst.nim
fixes #25509; removes void fields from a named tuple type (#25515)
2026-02-26 17:34:42 +01:00
sighashes.nim
fixes #25475; incompatible types errors for array types with different index types (#25505)
2026-02-16 09:14:03 +01:00
sigmatch.nim
fixes #25693 (#25842)
2026-05-29 08:26:35 +02:00
sinkparameter_inference.nim
IC: progress and refactorings (#22961)
2023-11-20 21:12:13 +01:00
sizealignoffsetimpl.nim
make PNode.typ a private field (#24326)
2025-01-14 07:46:40 +01:00
sourcemap.nim
chore: fix some typos (#23412)
2024-03-16 08:35:18 +08:00
spawn.nim
make PNode.typ a private field (#24326)
2025-01-14 07:46:40 +01:00
suggest.nim
makes DuplicateModuleImport back to an error (#25178)
2025-09-22 08:48:48 +02:00
suggestsymdb.nim
NimSuggest: Fix for the inlay exception hints with generic procs (#23610)
2025-07-19 08:17:30 +02:00
syntaxes.nim
fixes addr/hiddenAddr in strictdefs (#23477)
2024-04-10 14:41:16 +02:00
tccgen.nim
replaces doAssert false with raiseAssert for unreachable branches, which works better with strictdefs (#22436)
2023-08-10 14:26:40 +02:00
transf.nim
fixes #25469; Conversion from distinct in for forces a copy of underlying instance (#25746)
2026-04-17 12:03:05 +02:00
trees.nim
clean up opensym encounters in compiler (#24866)
2025-04-14 10:52:41 +02:00
treetab.nim
Align treetab hash with equivalence (#25354)
2025-12-15 20:29:49 +01:00
typeallowed.nim
fixes #25677; fixes #25678; typeAllowedAux to improve flag handling (#25684)
2026-03-30 15:10:17 +02:00
types.nim
fixes #25796; fixes procParamTypeRel to ensure backend type consistency (#25798)
2026-05-29 08:25:57 +02:00
typesrenderer.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
varpartitions.nim
fixes #23973; fixes #23974; Memory corruption with lent and ORC (#23981)
2024-08-20 11:57:47 +02:00
vm.nim
fixes #25446; [FieldDefect] with static: discard cast[pointer](default(pointer)) (#25448)
2026-01-26 09:12:59 +01:00
vmconv.nim
Types: Refactorings; step 1 (#23055)
2023-12-12 16:54:50 +01:00
vmdef.nim
fixes #25254; fixes #10395; Invalid pred in when swallowed (#25385)
2026-01-09 08:48:56 +01:00
vmdeps.nim
Fix getTypeImpl not returning defaults (#25592)
2026-03-10 09:30:31 +01:00
vmgen.nim
fixes #25682; fix vm genAsgn to handle statementListExpr (#25686)
2026-04-01 08:35:32 +02:00
vmhooks.nim
replaces doAssert false with raiseAssert for unreachable branches, which works better with strictdefs (#22436)
2023-08-10 14:26:40 +02:00
vmmarshal.nim
fixes addr/hiddenAddr in strictdefs (#23477)
2024-04-10 14:41:16 +02:00
vmops.nim
fixes #24941; missing < (less than), cmp for cstring (#24942)
2025-05-12 14:20:32 +02:00
vmprofiler.nim
prepare for the enforcement of std prefix (#22873)
2023-10-29 14:48:11 +01:00
vtables.nim
fixes #24476; remove proc type cast if they are same types for backends (#24480)
2025-01-14 12:24:00 +01:00
wordrecg.nim
Asm syntax pragma (#23119)
2023-12-25 07:12:54 +01:00

readme.md

Nim Compiler

  • This directory contains the Nim compiler written in Nim.
  • Note that this code has been translated from a bootstrapping version written in Pascal.
  • So the code is not a poster child of good Nim code.

See Internals of the Nim Compiler for more information.