Xcode-beta (7B85): lldb can’t print or execute anything in protocol extensions

Originator:rix.rob
Number:rdar://23158941 Date Originated:18-Oct-2015 01:34 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode-beta (7B85)
Classification:Crash/Hang/Data Loss Reproducible:Always
 
Summary:
When stopped at a frame in a protocol extension, lldb apparently can’t print or execute anything.


Steps to Reproduce:
1. Unzip the attached project.
2. Open it in Xcode.
3. Set a breakpoint in TermType+Construction.swift, on line 100 (if it’s not already set there).
4. Run the unit tests for the Manifold target.
5. When the debugger stops, attempt to print anything, whether a local binding, a parameter, `self`, or an expression constructed inline, e.g.:

	(lldb) po n
	(lldb) po type
	(lldb) po self
	(lldb) po "x"


Expected Results:
I expected the expressions to be evaluated and the results to be printed.


Actual Results:
It outputs this every time:
error: <EXPR>:1:1: error: non-nominal type '$__lldb_context' (aka 'Self') cannot be extended
extension $__lldb_context {                            
^         ~~~~~~~~~~~~~~~
<EXPR>:15:5: error: type 'Term' has no member '$__lldb_wrapped_expr_2'
    $__lldb_injected_self.$__lldb_wrapped_expr_2(     
    ^~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~


Regression:
This also happens in Xcode 7; it’s not a regression as far as I can see.


Notes:
N/A

Comments

Same error with Xcode 7.2.1 (7C1002)

The error is always present with the last official release of Xcode

By chbperso at Feb. 22, 2016, 2:45 p.m. (reply...)

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