Consider simplified logging/debugging for a variable

[ilyash-b]

# Current
log("Pipeline stack is ${pipeline_stack}")
# Maybe
log pipeline_stack
# Maybe
log(@pipeline_stack)

[ilyash]

Another use case for variable_name + variable_value combo: blah.set(argv=argv) - could be for example blah.set(@argv)

[ilyash]

How this should work if an expression is given? Maybe AST + value?