Formatter error with one-line begin/rescue

[t-richards]

Problem summary

crystal tool format crashes with "Error: couldn't format". I suspect this is because begin/rescue are on the same line.

Core information

OS: Arch Linux

$ crystal --version
Crystal 0.25.0 (2018-06-12)

LLVM: 6.0.0
Default target: x86_64-pc-linux-gnu

Complete error output

$ crystal tool format example.cr 
Error: couldn't format 'example.cr', please report a bug including the contents of it: https://github.com/crystal-lang/crystal/issues

expecting DELIMITER_START, not `[, `, at :4:22 (Exception)
Error opening file 'crystal' with mode 'r': No such file or directory
Unhandled exception: Error opening file 'crystal' with mode 'r': No such file or directory (Errno)
Failed to raise an exception: END_OF_STACK
[0x55fb443185b6] ???
[0x55fb43a66fab] __crystal_raise +43
[0x55fb43a6852c] ???
[0x55fb43a78b92] ???
[0x55fb43a7205b] ???
[0x55fb43a713aa] ???
[0x55fb43a6dea9] ???
[0x55fb43aa0161] ???
[0x55fb43a6aa3d] main +205
[0x7fa48db1906b] __libc_start_main +235
[0x55fb43a6373a] _start +42
[0x0] ???

Contents of example.cr

As requested by the error above. This code may not do things "the right way"™, but technically it does compile and run.

# File: example.cr

data = {} of String => Int32
my_value = begin data["a"] rescue 0 end
puts my_value