write for the left side of an assignment (=, +=, ...), read otherwise.
File of the read.
1-based line of the read.
Callables from the root to the one containing the read.
BootstrapRoot.label of the root the read is reachable from.
Trimmed source line of the read.
Timing of that root.
Matched watch expression, normalized by normalizeExpression.
A read of a watched expression reachable from a root.