$ jhbuild run gnome-shell --replace
Gtk-Message: 17:20:23.554: Failed to load module "canberra-gtk-module"
Gtk-Message: 17:20:23.555: Failed to load module "canberra-gtk-module"
Gjs-Message: 17:20:24.222: JS WARNING: [resource:///org/gnome/shell/ui/main.js 332]: reference to undefined property "MetaStage"
Gjs-Message: 17:20:24.234: JS WARNING: [resource:///org/gnome/shell/ui/layout.js 220]: reference to undefined property "MetaWindowGroup"
Gjs-Message: 17:20:24.274: JS WARNING: [resource:///org/gnome/shell/ui/osdMonitorLabeler.js 59]: reference to undefined property "MetaDBusDisplayConfigSkeleton"
current session already has an ibus-daemon.

(gnome-shell:6611): Gjs-WARNING **: 17:20:24.692: JS ERROR: Error: Requiring NMA, version none: Typelib file for namespace 'NMA' (any version) not found
@resource:///org/gnome/shell/misc/modemManager.js:5:7
@resource:///org/gnome/shell/ui/status/network.js:20:7
_init@resource:///org/gnome/shell/ui/panel.js:702:13
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
_Base.prototype._construct@resource:///org/gnome/gjs/modules/_legacy.js:18:5
Class.prototype._construct/newClass@resource:///org/gnome/gjs/modules/_legacy.js:114:32
_ensureIndicator@resource:///org/gnome/shell/ui/panel.js:1118:25
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
_updateBox@resource:///org/gnome/shell/ui/panel.js:1129:29
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
_updatePanel@resource:///org/gnome/shell/ui/panel.js:1040:9
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
_init@resource:///org/gnome/shell/ui/panel.js:822:9
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
_Base.prototype._construct@resource:///org/gnome/gjs/modules/_legacy.js:18:5
Class.prototype._construct/newClass@resource:///org/gnome/gjs/modules/_legacy.js:114:32
_initializeUI@resource:///org/gnome/shell/ui/main.js:184:13
start@resource:///org/gnome/shell/ui/main.js:133:5
@<main>:1:31

** Message: 17:20:24.692: Execution of main.js threw exception: Script <main> threw an exception