* using log directory ‘/srv/hornik/tmp/CRAN_pretest/igraph.Rcheck’
* using R Under development (unstable) (2026-01-26 r89334)
* using platform: x86_64-pc-linux-gnu
* R was compiled by
    Debian clang version 21.1.8 (1+b1)
    Debian flang version 21.1.8 (1+b1)
* running under: Debian GNU/Linux forky/sid
* using session charset: UTF-8
* checking for file ‘igraph/DESCRIPTION’ ... OK
* this is package ‘igraph’ version ‘2.2.2’
* package encoding: UTF-8
* checking CRAN incoming feasibility ... [9s/16s] OK
* checking package namespace information ... OK
* checking package dependencies ... OK
* checking if this is a source package ... OK
* checking if there is a namespace ... OK
* checking for executable files ... OK
* checking for hidden files and directories ... OK
* checking for portable file names ... OK
* checking for sufficient/correct file permissions ... OK
* checking whether package ‘igraph’ can be installed ... [135s/133s] OK
* used C compiler: ‘Debian clang version 21.1.8 (1+b1)’
* used C++ compiler: ‘Debian clang version 21.1.8 (1+b1)’
* checking package directory ... OK
* checking for future file timestamps ... OK
* checking ‘build’ directory ... OK
* checking DESCRIPTION meta-information ... OK
* checking top-level files ... OK
* checking for left-over files ... OK
* checking index information ... OK
* checking package subdirectories ... OK
* checking code files for non-ASCII characters ... OK
* checking R files for syntax errors ... OK
* checking whether the package can be loaded ... [0s/0s] OK
* checking whether the package can be loaded with stated dependencies ... [0s/0s] OK
* checking whether the package can be unloaded cleanly ... [0s/0s] OK
* checking whether the namespace can be loaded with stated dependencies ... [0s/0s] OK
* checking whether the namespace can be unloaded cleanly ... [0s/0s] OK
* checking loading without being on the library search path ... [0s/0s] OK
* checking whether startup messages can be suppressed ... [0s/0s] OK
* checking use of S3 registration ... OK
* checking dependencies in R code ... OK
* checking S3 generic/method consistency ... OK
* checking replacement functions ... OK
* checking foreign function calls ... OK
* checking R code for possible problems ... [29s/29s] OK
* checking Rd files ... [3s/3s] OK
* checking Rd metadata ... OK
* checking Rd line widths ... OK
* checking Rd cross-references ... OK
* checking for missing documentation entries ... OK
* checking for code/documentation mismatches ... OK
* checking Rd \usage sections ... OK
* checking Rd contents ... OK
* checking for unstated dependencies in examples ... OK
* checking line endings in shell scripts ... OK
* checking line endings in C/C++/Fortran sources/headers ... OK
* checking line endings in Makefiles ... OK
* checking compilation flags in Makevars ... OK
* checking for GNU extensions in Makefiles ... OK
* checking for portable use of $(BLAS_LIBS) and $(LAPACK_LIBS) ... OK
* checking use of PKG_*FLAGS in Makefiles ... OK
* checking use of SHLIB_OPENMP_*FLAGS in Makefiles ... OK
* checking pragmas in C/C++ headers and code ... OK
* checking compilation flags used ... OK
* checking compiled code ... OK
* checking installed files from ‘inst/doc’ ... OK
* checking files in ‘vignettes’ ... OK
* checking examples ... [42s/42s] OK
* checking for unstated dependencies in ‘tests’ ... OK
* checking tests ... [61s/28s] ERROR
  Running ‘testthat.R’ [61s/28s]
Running the tests in ‘tests/testthat.R’ failed.
Complete output:
  > library(testthat)
  > library(igraph)
  
  Attaching package: 'igraph'
  
  The following object is masked from 'package:testthat':
  
      compare
  
  The following objects are masked from 'package:stats':
  
      decompose, spectrum
  
  The following object is masked from 'package:base':
  
      union
  
  > 
  > test_check("igraph")
  Starting 2 test processes.
  Saving _problems/test-other-168.R
  Saving _problems/test-versions-35.R
  Saving _problems/test-versions-50.R
  Saving _problems/test-versions-65.R
  [ FAIL 4 | WARN 0 | SKIP 112 | PASS 5775 ]
  
  ══ Skipped tests (112) ═════════════════════════════════════════════════════════
  • On CRAN (108): 'test-aaa-auto.R:2:1', 'test-adjacency.R:610:1',
    'test-adjacency.R:639:1', 'test-adjacency.R:788:1',
    'test-attributes.R:437:1', 'test-attributes.R:466:1',
    'test-attributes.R:473:1', 'test-centrality.R:32:1',
    'test-centrality.R:88:1', 'test-centrality.R:145:3',
    'test-centrality.R:819:1', 'test-centrality.R:830:1',
    'test-community.R:378:1', 'test-conversion.R:47:1', 'test-conversion.R:54:1',
    'test-conversion.R:143:1', 'test-conversion.R:198:1',
    'test-conversion.R:566:1', 'test-conversion.R:680:1', 'test-fit.R:30:1',
    'test-foreign.R:24:1', 'test-foreign.R:33:1', 'test-foreign.R:42:1',
    'test-foreign.R:51:1', 'test-foreign.R:55:1', 'test-foreign.R:62:3',
    'test-flow.R:98:1', 'test-flow.R:143:1', 'test-flow.R:180:1',
    'test-flow.R:193:1', 'test-flow.R:213:1', 'test-flow.R:226:1',
    'test-flow.R:250:1', 'test-flow.R:292:1', 'test-hrg.R:10:1',
    'test-hrg.R:20:1', 'test-hrg.R:27:1', 'test-incidence.R:1:1',
    'test-incidence.R:19:1', 'test-incidence.R:112:1', 'test-incidence.R:130:1',
    'test-incidence.R:214:1', 'test-incidence.R:230:1', 'test-games.R:66:1',
    'test-games.R:90:1', 'test-interface.R:181:1', 'test-interface.R:202:1',
    'test-iterators.R:327:1', 'test-iterators.R:347:1', 'test-iterators.R:368:1',
    'test-iterators.R:444:1', 'test-layout.R:17:1', 'test-layout.R:158:3',
    'test-layout.R:213:1', 'test-layout.R:335:1',
    'test-minimum.spanning.tree.R:35:1', 'test-make.R:43:1', 'test-make.R:69:1',
    'test-make.R:78:1', 'test-make.R:86:1', 'test-make.R:96:1',
    'test-make.R:104:1', 'test-make.R:269:1', 'test-other.R:30:1',
    'test-other.R:39:3', 'test-other.R:52:1', 'test-other.R:161:1',
    'test-palette.R:192:1', 'test-palette.R:225:1', 'test-par.R:1:1',
    'test-par.R:11:1', 'test-paths.R:18:1', 'test-paths.R:42:1',
    'test-plot.R:1:1', 'test-plot.R:26:1', 'test-plot.R:51:1',
    'test-plot.R:89:1', 'test-plot.R:119:1', 'test-plot.R:142:1',
    'test-plot.R:150:1', 'test-plot.R:172:1', 'test-plot.R:189:1',
    'test-plot.R:214:1', 'test-plot.R:237:1', 'test-plot.shapes.R:129:1',
    'test-plot.shapes.R:159:1', 'test-plot.shapes.R:181:1',
    'test-plot.shapes.R:229:1', 'test-print.R:74:1', 'test-print.R:84:1',
    'test-print.R:101:1', 'test-print.R:117:1', 'test-print.R:132:1',
    'test-structural-properties.R:20:1', 'test-structural-properties.R:187:1',
    'test-structural-properties.R:207:1', 'test-structural-properties.R:754:1',
    'test-trees.R:218:1', 'test-operators.R:216:1',
    'test-utils-assert-args.R:1:1', 'test-utils-assert-args.R:9:1',
    'test-versions.R:8:1', 'test-versions.R:14:1', 'test-versions.R:24:1',
    'test-versions.R:39:1', 'test-versions.R:54:1', 'test-versions.R:69:1',
    'test-versions.R:94:1'
  • nested igraph call handling not implemented yet (1):
    'test-structural-properties.R:174:3'
  • {graph} is not installed (2): 'test-conversion.R:527:3',
    'test-conversion.R:555:3'
  • {pcalg} is not installed (1): 'test-adjacency.R:20:3'
  
  ══ Failed tests ════════════════════════════════════════════════════════════════
  ── Error ('test-other.R:168:3'): VS/ES work with old data type ─────────────────
  Error in `upgrade_graph(karate)`: igraph object is too old to upgrade.
  Backtrace:
      ▆
   1. └─igraph::upgrade_graph(karate) at test-other.R:168:3
  ── Error ('test-versions.R:35:3'): we can upgrade from 0.2 to 1.5.0, explicitly ──
  Error in `upgrade_graph(g)`: igraph object is too old to upgrade.
  Backtrace:
      ▆
   1. └─igraph::upgrade_graph(g) at test-versions.R:35:3
  ── Error ('test-versions.R:50:3'): we can upgrade from 0.5 to 1.5.0, explicitly ──
  Error in `upgrade_graph(g)`: igraph object is too old to upgrade.
  Backtrace:
      ▆
   1. └─igraph::upgrade_graph(g) at test-versions.R:50:3
  ── Error ('test-versions.R:65:3'): we can upgrade from 0.6 to 1.5.0, explicitly ──
  Error in `upgrade_graph(g)`: igraph object is too old to upgrade.
  Backtrace:
      ▆
   1. └─igraph::upgrade_graph(g) at test-versions.R:65:3
  
  [ FAIL 4 | WARN 0 | SKIP 112 | PASS 5775 ]
  Error:
  ! Test failures.
  Execution halted
* checking for unstated dependencies in vignettes ... OK
* checking package vignettes ... OK
* checking re-building of vignette outputs ... [6s/6s] OK
* checking PDF version of manual ... [19s/19s] OK
* checking HTML version of manual ... [32s/32s] OK
* checking for non-standard things in the check directory ... OK
* checking for detritus in the temp directory ... OK
* DONE
Status: 1 ERROR