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This basic function with a default argument works both interpreted and compiled:

function f(a = true) { }

Adding a type annotation like so

function f(a : bool = true) { }

breaks the interpreted run:

qml: Type annotations are not supported (yet).

But worse yet, qmlsc silently crashes on this line.

is duplicated by

QTBUG-105547 [QML] Default parameters with type annotations not supported

QTBUG-101007 It should be possible to type javascript rest parameters

QTBUG-123477 Allow typed functions to work with default parameters

relates to

QTBUG-98195 Default function arguments have the wrong scope

For Gerrit Dashboard: QTBUG-104751
#	Subject	Branch	Project	Status	CR	V
631779,2	qv4codegen: Improve warning about type annotations on default parameters	dev	qt/qtdeclarative	Status: NEW	+2	0
420177,1	WIP: Half-support arguments with type annotations and default values	dev	qt/qtdeclarative	Status: DEFERRED	-2	0
631714,4	qmllint: Warn about unsupported type annotations	dev	qt/qtdeclarative	Status: MERGED	+2	0
631921,2	qmllint: Warn about unsupported type annotations	6.9	qt/qtdeclarative	Status: MERGED	+2	0
632023,2	qmllint: Warn about unsupported type annotations	6.8	qt/qtdeclarative	Status: MERGED	+2	0