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--- !ruby/object:RI::MethodDescription
aliases: []
block_params:
comment:
- !ruby/struct:SM::Flow::P
body: Controls tracing of assignments to global variables. The parameter +symbol_ identifies the variable (as either a string name or a symbol identifier). <em>cmd</em> (which may be a string or a <tt>Proc</tt> object) or block is executed whenever the variable is assigned. The block or <tt>Proc</tt> object receives the variable's new value as a parameter. Also see <tt>Kernel::untrace_var</tt>.
- !ruby/struct:SM::Flow::VERB
body: " trace_var :$_, proc {|v| puts "$_ is now '#{v}'" }\n $_ = "hello"\n $_ = ' there'\n"
- !ruby/struct:SM::Flow::P
body: <em>produces:</em>
- !ruby/struct:SM::Flow::VERB
body: " $_ is now 'hello'\n $_ is now ' there'\n"
full_name: Kernel#trace_var
is_singleton: false
name: trace_var
params: |
trace_var(symbol, cmd ) => nil
trace_var(symbol) {|val| block } => nil
visibility: public