Incorrect SyntaxError location for walrus operator in multi-line conditional expression

Bug report

Bug description:

When using the walrus operator (:=) inside a multi-line conditional expression, Python raises a SyntaxError with the error position pointing to the wrong location.
The caret (^) is shown under the expression body instead of the if clause where the syntax issue actually occurs, making debugging misleading.
The error indicator should instead highlight the if portion (or walrus usage context), not the preceding expression line.

Code

(
    1
    if x := True
    else 2
)

Traceback

File "[REDACTED]", line 2
    1
    ^
SyntaxError: expected 'else' after 'if' expression

It locates error to 1 but it should have located to if x := True (line no. 3)

It does not errors when condition is parenthesized:

(
    1
    if (x := True)
    else 2
)  # output: 1

CPython versions tested on:

3.14

Operating systems tested on:

Linux

Linked PRs

• gh-146305

Reproduisez l’expression conditionnelle multiligne et sa variante entre parenthèses sur CPython 3.14, puis suivez la gestion de l’emplacement du parser ou de l’erreur de syntaxe pour l’expression walrus. C’est terminé lorsque le curseur pointe vers la ligne if x := True, tandis que le cas entre parenthèses continue d’être analysé correctement et d’indiquer son résultat.