lobstr

Visualize R Data Structures with Trees

v1.2.1 · Apr 3, 2026 · MIT + file LICENSE

Description

A set of tools for inspecting and understanding R data structures inspired by str(). Includes ast() for visualizing abstract syntax trees, ref() for showing shared references, cst() for showing call stack trees, and obj_size() for computing object sizes.

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CRAN Check Status

3 WARNING

4 NOTE

7 OK

Show all 14 flavors

Flavor	Status	Time
r-devel-linux-x86_64-debian-clang	WARNING	54.7s
r-devel-linux-x86_64-debian-gcc	OK	40.9s
r-devel-linux-x86_64-fedora-clang	OK	90.6s
r-devel-linux-x86_64-fedora-gcc	WARNING	91.7s
r-devel-macos-arm64	OK	16s
r-devel-windows-x86_64	OK	106s
r-oldrel-macos-arm64	OK	49s
r-oldrel-macos-x86_64	OK	144s
r-oldrel-windows-x86_64	OK	119s
r-patched-linux-x86_64	WARNING	50.1s
r-release-linux-x86_64	NOTE	46s
r-release-macos-arm64	NOTE	15s
r-release-macos-x86_64	NOTE	159s
r-release-windows-x86_64	NOTE	109s

Check details (7 non-OK)

WARNING r-devel-linux-x86_64-debian-clang

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_NamespaceRegistry’,
    ‘R_PromiseExpr’, ‘R_UnboundValue’, ‘Rf_allocSExp’,
    ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’
These entry points may be removed soon:
‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘PRENV’, ‘SET_PRENV’, ‘PRVALUE’, ‘SET_PRVALUE’, ‘R_PromiseExpr’, ‘Rf_allocSExp’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

WARNING r-devel-linux-x86_64-fedora-gcc

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_NamespaceRegistry’,
    ‘R_PromiseExpr’, ‘R_UnboundValue’, ‘Rf_allocSExp’,
    ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’
These entry points may be removed soon:
‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘PRENV’, ‘SET_PRENV’, ‘PRVALUE’, ‘SET_PRVALUE’, ‘R_PromiseExpr’, ‘Rf_allocSExp’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

WARNING r-patched-linux-x86_64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_MissingArg’,
    ‘R_NamespaceRegistry’, ‘R_PromiseExpr’, ‘R_UnboundValue’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’,
    ‘SET_PRVALUE’
These entry points may be removed soon:
‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘PRENV’, ‘SET_PRENV’, ‘PRVALUE’, ‘SET_PRVALUE’, ‘R_PromiseExpr’, ‘Rf_allocSExp’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-release-linux-x86_64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SETLENGTH’,
    ‘SET_GROWABLE_BIT’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’,
    ‘SET_TRUELENGTH’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-release-macos-arm64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SETLENGTH’,
    ‘SET_GROWABLE_BIT’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’,
    ‘SET_TRUELENGTH’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-release-macos-x86_64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SETLENGTH’,
    ‘SET_GROWABLE_BIT’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’,
    ‘SET_TRUELENGTH’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-release-windows-x86_64

compiled code

File 'lobstr/libs/x64/lobstr.dll':
  Found non-API calls to R: 'PRENV', 'PRVALUE', 'R_PromiseExpr',
    'Rf_allocSExp', 'Rf_findVarInFrame3', 'SETLENGTH',
    'SET_GROWABLE_BIT', 'SET_PRCODE', 'SET_PRENV', 'SET_PRVALUE',
    'SET_TRUELENGTH'

Compiled code should not call non-API entry points in R.

See 'Writing portable packages' in the 'Writing R Extensions' manual,
and section 'Moving into C API compliance' for issues with the use of
non-API entry points.

Check History

WARNING 3 OK · 10 NOTE · 1 WARNING · 0 ERROR · 0 FAILURE Mar 16, 2026

NOTE r-devel-linux-x86_64-debian-clang

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’,
    ‘SET_PRVALUE’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

WARNING r-devel-linux-x86_64-debian-gcc

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’,
    ‘SET_PRVALUE’
This entry point may be removed soon:
‘Rf_findVarInFrame3’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-devel-linux-x86_64-fedora-clang

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’,
    ‘SET_PRVALUE’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-devel-linux-x86_64-fedora-gcc

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’,
    ‘SET_PRVALUE’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-devel-macos-arm64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’,
    ‘SET_PRVALUE’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-devel-windows-x86_64

compiled code

File 'lobstr/libs/x64/lobstr.dll':
  Found non-API calls to R: 'PRENV', 'PRVALUE', 'R_PromiseExpr',
    'Rf_allocSExp', 'Rf_findVarInFrame3', 'SET_PRCODE', 'SET_PRENV',
    'SET_PRVALUE'

Compiled code should not call non-API entry points in R.

See 'Writing portable packages' in the 'Writing R Extensions' manual,
and section 'Moving into C API compliance' for issues with the use of
non-API entry points.

NOTE r-patched-linux-x86_64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SETLENGTH’,
    ‘SET_GROWABLE_BIT’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’,
    ‘SET_TRUELENGTH’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-release-linux-x86_64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SETLENGTH’,
    ‘SET_GROWABLE_BIT’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’,
    ‘SET_TRUELENGTH’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-release-macos-arm64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SETLENGTH’,
    ‘SET_GROWABLE_BIT’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’,
    ‘SET_TRUELENGTH’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-release-macos-x86_64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SETLENGTH’,
    ‘SET_GROWABLE_BIT’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’,
    ‘SET_TRUELENGTH’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-release-windows-x86_64

compiled code

File 'lobstr/libs/x64/lobstr.dll':
  Found non-API calls to R: 'PRENV', 'PRVALUE', 'R_PromiseExpr',
    'Rf_allocSExp', 'Rf_findVarInFrame3', 'SETLENGTH',
    'SET_GROWABLE_BIT', 'SET_PRCODE', 'SET_PRENV', 'SET_PRVALUE',
    'SET_TRUELENGTH'

Compiled code should not call non-API entry points in R.

See 'Writing portable packages' in the 'Writing R Extensions' manual,
and section 'Moving into C API compliance' for issues with the use of
non-API entry points.

NOTE 3 OK · 11 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE Mar 10, 2026

NOTE r-devel-linux-x86_64-debian-clang

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’,
    ‘SET_PRVALUE’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-devel-linux-x86_64-debian-gcc

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’,
    ‘SET_PRVALUE’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-devel-linux-x86_64-fedora-clang

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’,
    ‘SET_PRVALUE’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-devel-linux-x86_64-fedora-gcc

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’,
    ‘SET_PRVALUE’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-devel-macos-arm64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SET_PRCODE’, ‘SET_PRENV’,
    ‘SET_PRVALUE’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-devel-windows-x86_64

compiled code

File 'lobstr/libs/x64/lobstr.dll':
  Found non-API calls to R: 'PRENV', 'PRVALUE', 'R_PromiseExpr',
    'Rf_allocSExp', 'Rf_findVarInFrame3', 'SET_PRCODE', 'SET_PRENV',
    'SET_PRVALUE'

Compiled code should not call non-API entry points in R.

See 'Writing portable packages' in the 'Writing R Extensions' manual,
and section 'Moving into C API compliance' for issues with the use of
non-API entry points.

NOTE r-patched-linux-x86_64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SETLENGTH’,
    ‘SET_GROWABLE_BIT’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’,
    ‘SET_TRUELENGTH’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-release-linux-x86_64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SETLENGTH’,
    ‘SET_GROWABLE_BIT’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’,
    ‘SET_TRUELENGTH’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-release-macos-arm64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SETLENGTH’,
    ‘SET_GROWABLE_BIT’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’,
    ‘SET_TRUELENGTH’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-release-macos-x86_64

compiled code

File ‘lobstr/libs/lobstr.so’:
  Found non-API calls to R: ‘PRENV’, ‘PRVALUE’, ‘R_PromiseExpr’,
    ‘Rf_allocSExp’, ‘Rf_findVarInFrame3’, ‘SETLENGTH’,
    ‘SET_GROWABLE_BIT’, ‘SET_PRCODE’, ‘SET_PRENV’, ‘SET_PRVALUE’,
    ‘SET_TRUELENGTH’

Compiled code should not call non-API entry points in R.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
and section ‘Moving into C API compliance’ for issues with the use of
non-API entry points.

NOTE r-release-windows-x86_64

compiled code

File 'lobstr/libs/x64/lobstr.dll':
  Found non-API calls to R: 'PRENV', 'PRVALUE', 'R_PromiseExpr',
    'Rf_allocSExp', 'Rf_findVarInFrame3', 'SETLENGTH',
    'SET_GROWABLE_BIT', 'SET_PRCODE', 'SET_PRENV', 'SET_PRVALUE',
    'SET_TRUELENGTH'

Compiled code should not call non-API entry points in R.

See 'Writing portable packages' in the 'Writing R Extensions' manual,
and section 'Moving into C API compliance' for issues with the use of
non-API entry points.

Reverse Dependencies (24)

imports

REDCapTidieR SpaDES.core brclimr butcher carrier httping interfacer potions reproducible sourcoise traktok

suggests

R6 cpp11 dataquieR dplyr duckplyr einops genio gginnards glyrepr kidsides nestedLogit sport tmap

Dependency Network

Version History

updated 1.2.1 ← 1.2.0 diff Apr 3, 2026

new 1.2.0 Mar 10, 2026

updated 1.2.0 ← 1.1.3 diff Feb 17, 2026

updated 1.1.3 ← 1.1.2 diff Nov 13, 2025

updated 1.1.2 ← 1.1.1 diff Jun 22, 2022

updated 1.1.1 ← 1.1.0 diff Jul 2, 2019

updated 1.1.0 ← 1.0.1 diff Jun 19, 2019

updated 1.0.1 ← 1.0.0 diff Dec 20, 2018

new 1.0.0 Nov 3, 2018

Maintainer

Hadley Wickham

Dependencies

Depends

R (>= 3.6.0)

Imports

crayon methods prettyunits rlang (>= 1.0.0)

Suggests

covr pillar pkgdown testthat (>= 3.0.0)

Compilation

Needs compilation

First Published

Nov 3, 2018

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