(gdb) b foo.cr:1
Breakpoint 1 at 0x100000ce5: file /Users/ggiraldez/ScratchPad/crystal-debug/foo.cr, line 1.
(gdb) b bar.cr:1
Breakpoint 2 at 0x100000d40: file /Users/ggiraldez/ScratchPad/crystal-debug/bar.cr, line 1.
(gdb) run
Starting program: /Users/ggiraldez/ScratchPad/crystal-debug/bar

Breakpoint 1, __crystal_main () at /Users/ggiraldez/ScratchPad/crystal-debug/foo.cr:1
1   foo1 = 1
(gdb) info locals
foo1 = 32767
foo2 = 1900987092
foo3 = 32767
foo4 = -2028132910
(gdb) n
2   foo2 = 10
(gdb) n
3   foo3 = 100
(gdb) n
4   foo4 = foo1 + foo2 + foo3
(gdb) n
6   puts "foo4 = #{foo4}"
(gdb) info locals
foo1 = 1
foo2 = 10
foo3 = 100
foo4 = 111
(gdb) c
Continuing.
foo4 = 111

Breakpoint 2, __crystal_main () at /Users/ggiraldez/ScratchPad/crystal-debug/bar.cr:3
3   bar1 = 2
(gdb) info locals
bar1 = 32767
bar2 = 1606416352
bar3 = 1
bar4 = 34723
(gdb) n
4   bar2 = 3
(gdb) n
5   bar3 = 5
(gdb) n
6   bar4 = bar1 * bar2 * bar3
(gdb) n
8   puts "bar4 = #{bar4}"
(gdb) info locals
bar1 = 2
bar2 = 3
bar3 = 5
bar4 = 30