Type error when validating list of unhashable items a set with a `TypeAdapter`

[mikeedjones]

Initial Checks

• I confirm that I'm using Pydantic V2

Description

When validating a list of unhashable items as a set using a TypeAdapter, pydantic raises a TypeError as opposed to a ValidationError.

Example Code

from pydantic import TypeAdapter

TypeAdapter(set).validate_python([{"a":"b"}])

# E   TypeError: unhashable type: 'dict'

Probably related to #8016 but I think this is more clearly a bug, since

from pydantic import TypeAdapter

TypeAdapter(set).validate_python({"a":"b"})

# E       pydantic_core._pydantic_core.ValidationError: 1 validation error for set[any]
# E         Input should be a valid set [type=set_type, input_value={'a': 'b'}, input_type=dict]
# E           For further information visit https://errors.pydantic.dev/2.10/v/set_type

Works as expected.

Python, Pydantic & OS Version

pydantic version: 2.10.1
        pydantic-core version: 2.27.1
          pydantic-core build: profile=release pgo=false
                 install path: /workspaces/pydantic-ai/.venv/lib/python3.11/site-packages/pydantic
               python version: 3.11.4 (main, Jun  7 2023, 18:32:58) [GCC 10.2.1 20210110]
                     platform: Linux-6.8.0-1020-gcp-x86_64-with-glibc2.31
             related packages: typing_extensions-4.12.2 mypy-1.13.0 pyright-1.1.389 fastapi-0.115.5
                       commit: unknown

[sydney-runkle]

Indeed, this should raise a ValidationError. Thanks for bringing this to our attention!

This should be fixed in pydantic-core.

[mikeedjones]

pydantic/pydantic-core#1619

@sydney-runkle Had a go at resolving this - not sure if it was what you you had in mind!

[sydney-runkle]

Fixed via #11402