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Bug 350537

Summary:

[validation] Type mismatch when rewriting an object

Product:

[WebTools] JSDT

Reporter:

Dusan Smolnikar <dusan.smolnikar>

Component:

General

Assignee:

Chris Jaun <cmjaun>

Status:

RESOLVED FIXED

QA Contact:

Nitin Dahyabhai <thatnitind>

Severity:

minor

Priority:

CC:

cmjaun

Version:

unspecified

Flags:

thatnitind: review+

Target Milestone:

3.2.5

Hardware:

Macintosh

OS:

Mac OS X - Carbon (unsup.)

Whiteboard:

Attachments:

Description	Flags
patch	none

Description Dusan Smolnikar

2011-06-28 05:37:42 EDT

Build Identifier: 20110407183333

Enter the following code into a .js file:
-----
// Create objects
var foo = {
	bar : {}
};

// Set some properties
foo.bar.one = 1;
foo.bar.two = 2;

// Reset the object
foo.bar = {};
-----

On the last line, I will get a javascript warning:
Type mismatch: cannot convert from ___anonymous346782_346783 to ___anonymous346761_346762

There doesn't seem to be anything wrong with the code. I am simply overwriting an object with a new object.

If, however, I do the following:
-----
...
// Reset the object
foo.bar = new Object();
-----

I do not get a warning. From my understanding of javascript, the two declarations are equivalent.

Reproducible: Always

Steps to Reproduce:
In eclipse preferences go to:
JavaScript > Validator > Error/Warnings
and enable JavaScript semantic validation.

This will enable display of warnings, such as described above.

Comment 1 Chris Jaun

2011-06-29 15:15:33 EDT

Created attachment 198856 [details]
patch

Removes error reported for mis-matched types on assignment statements.

Anything can be assigned to anything in JavaScript, no need for such checking.

Comment 2 Chris Jaun

2011-07-01 10:42:49 EDT

Checked into 3.2.5 and HEAD.