[Bug]: Fail to find function in AST when using decorator to generate function names

### Component

UI (ui.*)

### Severity

P2 - Medium (workaround exists)

### Shiny Version

shiny=1.4.0

### Python Version

python=3.10.18

### Minimal Reproducible Example

```python
import faicons as fa
import pandas as pd

from shiny import reactive, render
from shiny.express import ui

class_labels = [('human_animal', "Human/Animal"),
                ('environmental', "Environmental"),
                ('foodstuff', "Foods and Fluids"),
                ('other', "Other")] 

# Add page title 
ui.page_opts(title="Dashboard", fillable=True)

# MAIN PANEL CONTENT
ICONS = {
    "doc": fa.icon_svg("file"),
    "human_animal": fa.icon_svg("user", "regular"),
    "environmental": fa.icon_svg("leaf"),
    "foodstuff": fa.icon_svg("utensils"),
    "other": fa.icon_svg("question"),

}

def extend_name(extension):
    """ Decorator to extend the name of a function with a given extension."""
    def decorator(f):
        f.__name__ = f.__name__ + extension
        return f
    return decorator

with ui.layout_columns(fill=False):
    with ui.value_box(showcase=ICONS["doc"]):
        "Total documents"
        @render.express
        def total_docs():
            150

    for label_name, label_ui in class_labels:
        with ui.value_box(showcase=ICONS[label_name]):
            print(label_name, label_ui)
            label_ui
            @render.express
            @extend_name(f"_{label_name}")
            def docs_label():
                labels = docs_labels()
                if label_name in labels.index:
                    return str(labels[label_name])
                else:
                    return 0

@reactive.calc
def docs_labels():
    return  pd.Series(
        [150, 50, 30, 20],
        index=["human_animal", "environmental", "foodstuff", "other"]
    )
```

### Behavior

When using a decorator to generate unique names for functions within ui.value_box, the app crashes with `RuntimeError: Failed to find function 'docs_label_human_animal' in AST. This should never happen, please file an issue!`
The piece of code that cause this is this:
            @render.express
            @extend_name(f"_{label_name}")
            def docs_label():
                labels = docs_labels()
                if label_name in labels.index:
                    return str(labels[label_name])
                else:
                    return 0


### Error Messages (if any)

```shell
RuntimeError: Failed to find function 'docs_label_human_animal' in AST. This should never happen, please file an issue!
```

### Environment

```markdown
MacOS Sanoma 14.5
Chrome Version 137.0.7151.104


Environment:


# This file may be used to create an environment using:
# $ conda create --name <env> --file <this file>
# platform: osx-arm64
# created-by: conda 25.5.0
anyio=4.9.0=pyh29332c3_0
anywidget=0.9.18=pyhd8ed1ab_0
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argon2-cffi=25.1.0=pyhd8ed1ab_0
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arrow=1.3.0=pyhd8ed1ab_1
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async-lru=2.0.5=pyh29332c3_0
attrs=25.3.0=pyh71513ae_0
babel=2.17.0=pyhd8ed1ab_0
beautifulsoup4=4.13.4=pyha770c72_0
bleach=6.2.0=pyh29332c3_4
bleach-with-css=6.2.0=h82add2a_4
brotli=1.1.0=hd74edd7_2
brotli-bin=1.1.0=hd74edd7_2
brotli-python=1.0.9=py310h0f1eb42_8
bzip2=1.0.8=h99b78c6_7
ca-certificates=2025.4.26=hbd8a1cb_0
cached-property=1.5.2=hd8ed1ab_1
cached_property=1.5.2=pyha770c72_1
certifi=2025.4.26=pyhd8ed1ab_0
cffi=1.17.1=py310h497396d_0
charset-normalizer=3.4.2=pyhd8ed1ab_0
click=8.2.1=pyh707e725_0
comm=0.2.1=py310hca03da5_0
contourpy=1.0.7=py310h2887b22_0
cycler=0.12.1=pyhd8ed1ab_1
debugpy=1.8.11=py310h313beb8_0
decorator=5.1.1=pyhd3eb1b0_0
defusedxml=0.7.1=pyhd8ed1ab_0
exceptiongroup=1.3.0=pyhd8ed1ab_0
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h11=0.16.0=pyhd8ed1ab_0
h2=4.2.0=pyhd8ed1ab_0
hpack=4.1.0=pyhd8ed1ab_0
htmltools=0.6.0=pyhd8ed1ab_0
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httpx=0.28.1=pyhd8ed1ab_0
hyperframe=6.1.0=pyhd8ed1ab_0
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jupyterlab_pygments=0.3.0=pyhd8ed1ab_2
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lcms2=2.15=hd835a16_1
lerc=4.0.0=h9a09cb3_0
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libbrotlidec=1.1.0=hd74edd7_2
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libcblas=3.9.0=20_osxarm64_openblas
libcxx=14.0.6=h848a8c0_0
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liblzma-devel=5.8.1=h39f12f2_1
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zstd=1.5.7=h6491c7d_2
```

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[Bug]: Fail to find function in AST when using decorator to generate function names #2016

Component

Severity

Shiny Version

Python Version

Minimal Reproducible Example

Behavior

Error Messages (if any)

Environment

Metadata

Assignees

Labels

Type

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Development

[Bug]: Fail to find function in AST when using decorator to generate function names #2016

Description

Component

Severity

Shiny Version

Python Version

Minimal Reproducible Example

Behavior

Error Messages (if any)

Environment

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions