I made d2/tala panic with a very short schema

[dohzya]

Tala panics when I try to generate a svg from this content:

# generated at 2023-04-14T09:36:16.817Z

____header: |||md
Index
||| { near: top-center }
____body: |||md
[HLD](hld/index.svg) | [LLD](lld/index.svg)
|||

Example

% cat perdu.d2
# generated at 2023-04-14T09:36:16.817Z

____header: |||md
Index
||| { near: top-center }
____body: |||md
[HLD](hld/index.svg) | [LLD](lld/index.svg)
|||
% d2 --layout=tala perdu.d2
err: failed to compile: exit status 2
err: stderr:
err: panic: runtime error: invalid memory address or nil pointer dereference
err: [signal SIGSEGV: segmentation violation code=0x2 addr=0x40 pc=0x10592a6f0]
err:
err: goroutine 67 [running]:
err: github.com/terrastruct/src/backend/tala/transpilers/d2transpiler.PopulateNodes.func3(0x14000e09450, 0x18?)
err:    github.com/terrastruct/src/backend/tala/transpilers/d2transpiler/d2transpiler.go:87 +0xd0
err: github.com/terrastruct/src/backend/tala/transpilers/d2transpiler.PopulateNodes.func1(0x14000e09450, 0x0?, 0x14000c94f30)
err:    github.com/terrastruct/src/backend/tala/transpilers/d2transpiler/d2transpiler.go:37 +0x38
err: github.com/terrastruct/src/backend/tala/transpilers/d2transpiler.PopulateNodes.func1(0x14000e08000, 0x57199f883bccd?, 0x14000c94f30)
err:    github.com/terrastruct/src/backend/tala/transpilers/d2transpiler/d2transpiler.go:40 +0x7c
err: github.com/terrastruct/src/backend/tala/transpilers/d2transpiler.PopulateNodes({0x14000d2ba98?, 0x104c53df4?}, 0x140008fd970, 0x14000caafc0)
err:    github.com/terrastruct/src/backend/tala/transpilers/d2transpiler/d2transpiler.go:82 +0x204
err: github.com/terrastruct/src/backend/tala/transpilers/d2transpiler.RaceSeeds({0x106a76418, 0x14000a3c780}, 0x106a76418?, 0x14000caafc0, {0x14000580760, 0x3, 0x140001e6e40?}, 0x0, 0x0)
err:    github.com/terrastruct/src/backend/tala/transpilers/d2transpiler/d2transpiler.go:155 +0xa8
err: github.com/terrastruct/src/backend/tala/transpilers/d2transpiler.Layout({0x106a76418, 0x14000a3c780}, 0x0?, 0x0?)
err:    github.com/terrastruct/src/backend/tala/transpilers/d2transpiler/d2transpiler.go:317 +0x244
err: main.talaPlugin.Layout({0x14000c84540?, 0x14000c33d40?}, {0x106a76418?, 0x14000a3c780?}, 0x0?)
err:    github.com/terrastruct/src/backend/tala/cmd/d2plugin-tala/plugin_tala.go:161 +0x100
err: oss.terrastruct.com/d2/d2plugin.layout({0x106a76418, 0x14000a3c780}, {0x106a79660, 0x1400093ed60}, 0x140003c8d90)
err:    oss.terrastruct.com/d2@v0.2.7-0.20230330041458-114e91c4a4f4/d2plugin/serve.go:106 +0x94
err: oss.terrastruct.com/d2/d2plugin.Serve.func1({0x106a76418, 0x14000a3c780}, 0x140003c8d90)
err:    oss.terrastruct.com/d2@v0.2.7-0.20230330041458-114e91c4a4f4/d2plugin/serve.go:56 +0x2b8
err: oss.terrastruct.com/util-go/xmain.(*State).Main.func1()
err:    oss.terrastruct.com/util-go@v0.0.0-20230320053557-dcb5aac7d972/xmain/xmain.go:105 +0x68
err: created by oss.terrastruct.com/util-go/xmain.(*State).Main
err:    oss.terrastruct.com/util-go@v0.0.0-20230320053557-dcb5aac7d972/xmain/xmain.go:103 +0x110
% 

Other info

• Same problem when using stdio instead of a file
• No problem when using elk instead of tala
• I'm using up-to-date versions, as far as brew upgrade is concerned

% d2 --version
0.4.0
% d2plugin-tala --version
v0.3.5

[gavin-ts]

tala v0.3.5 isn't fully compatible with d2 v0.4.0, but this works with d2 v0.3.0 and the next tala release will be compatible with d2 0.4.0

[alixander]

should be fixed now with new release