{{ foo }}
{# ^^^ @variable #}

{{ foo.bar }}
{# ^^^ @variable #}
{#     ^^^ @variable.member #}

{{ foo['bar'] }}
{# ^^^ @variable #}
{#     ^^^^^ @string #}

{{ foo.bar.baz }}
{# ^^^ @variable #}
{#     ^^^ @variable.member #}
{#         ^^^ @variable.member #}

{{ foo.bar + baz.qux }}
{# ^^^ @variable #}
{#     ^^^ @variable.member #}
{#           ^^^ @variable #}
{#               ^^^ @variable.member #}