bug #15101 [Form] Fixed compatibility with FormTypeInterface implementations that don't extend AbstractType (webmozart)
bug #15101 [Form] Fixed compatibility with FormTypeInterface implementations that don't extend AbstractType (webmozart)

This PR was merged into the 2.7 branch.

Discussion
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[Form] Fixed compatibility with FormTypeInterface implementations that don't extend AbstractType

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
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4a1ad7e [Form] Fixed compatibility with FormTypeInterface implementations that don't extend AbstractType

symfony/Form