ast: missing type info for chan

[dy-tea]

Describe the bug

Code: https://play.vlang.io/p/8f98a7556f

pub fn process_dbcalls(tname string, chans map[string]chan){
    input_ch := chans['input']
    output_ch := chans['output']
    task_str := <- input_ch
    println(task_str)
}

Reproduction Steps

Included code.

Expected Behavior

Should not crash.

Current Behavior

Output:

V panic: TypeSymbol.chan_info: no info for type: chan
 v hash: 996f0fe
    pid: 0x2
    tid: 0x2
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:19979: at builtin___v_panic: Backtrace
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:41243: by v__ast__TypeSymbol_no_info_panic
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:41313: by v__ast__TypeSymbol_chan_info
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:58637: by v__checker__Checker_prefix_expr
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:56460: by v__checker__Checker_expr
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:50226: by v__checker__Checker_assign_stmt
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:55124: by v__checker__Checker_stmt
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:55764: by v__checker__Checker_stmts_ending_with_expression
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:55741: by v__checker__Checker_stmts
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:64579: by v__checker__Checker_fn_decl
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:55147: by v__checker__Checker_stmt
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:53007: by v__checker__Checker_check
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:53076: by v__checker__Checker_check_files
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:56142: by v__builder__Builder_middle_stages
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:56183: by v__builder__Builder_front_and_middle_stages
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:58724: by v__builder__cbuilder__gen_c
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:58696: by v__builder__cbuilder__build_c
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:58687: by v__builder__cbuilder__compile_c
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:58604: by v__builder__Builder_rebuild
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:57750: by v__builder__compile
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:59116: by main__rebuild
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:59068: by main__main
/tmp/v_1000/v.01KASQEM4FTF5T77SXQP6JV8P6.tmp.c:60080: by main
Exited with error status 1

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.12 996f0fe

Environment details (OS name and version, etc.)

|V full version      |V 0.4.12 996f0fea1205614ed4537f346c4e642e1d219803
|:-------------------|:-------------------
|OS                  |linux, Debian GNU/Linux 12 (bookworm) (VM)
|Processor           |2 cpus, 64bit, little endian, Intel(R) Xeon(R) CPU E5-2680 v4 @ 2.40GHz
|Memory              |0.82GB/2.02GB
|                    |
|V executable        |/home/admin/v/v
|V last modified time|2025-11-24 01:25:37
|                    |
|V home dir          |OK, value: /home/admin/v
|VMODULES            |OK, value: .vmodules
|VTMP                |OK, value: /tmp/v_0
|Current working dir |OK, value: /home/admin/playground
|                    |
|Git version         |git version 2.39.5
|V git status        |N/A
|.git/config present |true
|                    |
|cc version          |cc (Debian 12.2.0-14+deb12u1) 12.2.0
|gcc version         |gcc (Debian 12.2.0-14+deb12u1) 12.2.0
|clang version       |Debian clang version 14.0.6
|tcc version         |tcc version 0.9.28rc 2025-02-13 HEAD@f8bd136d (x86_64 Linux)
|tcc git status      |Error: fatal: detected dubious ownership in repository at '/home/admin/v/thirdparty/tcc'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v/thirdparty/tcc
 Error: fatal: detected dubious ownership in repository at '/home/admin/v/thirdparty/tcc'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v/thirdparty/tcc

|emcc version        |N/A
|glibc version       |ldd (Debian GLIBC 2.36-9+deb12u10) 2.36

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[quaesitor-scientiam]

Have same issue

PS S:\repo\vlang> v doctor
|V full version      |V 0.4.12 caf7d413ad1a68aafc20e2a2786d08c30a3964d7.8fc0f90
|:-------------------|:-------------------
|OS                  |windows, Microsoft Windows 11 Pro 26200 64-bit
|Processor           |24 cpus, 64bit, little endian, AMD Ryzen 9 5900X 12-Core Processor
|Memory              |66.42GB/127.92GB
|                    |
|V executable        |S:\repo\vlang\v.exe
|V last modified time|2025-11-24 01:49:21
|                    |
|V home dir          |OK, value: S:\repo\vlang
|VMODULES            |OK, value: C:\Users\john3\.vmodules
|VTMP                |OK, value: S:\temp\v_0
|Current working dir |OK, value: S:\repo\vlang
|                    |
|Git version         |git version 2.45.1.windows.1
|V git status        |weekly.2025.47-94-g8fc0f900
|.git/config present |true
|                    |
|cc version          |cc (Rev8, Built by MSYS2 project) 15.2.0
|gcc version         |gcc (Rev8, Built by MSYS2 project) 15.2.0
|clang version       |clang version 19.1.5
|msvc version        |Microsoft (R) C/C++ Optimizing Compiler Version 19.44.35220 for x64
|tcc version         |tcc version 0.9.27 (x86_64 Windows)
|tcc git status      |thirdparty-windows-amd64 b425ac82
|emcc version        |N/A
|glibc version       |ldd (cygwin) 3.6.4