$ csc implementations.scm -o implementations && ./implementations -:d 
[debug] application startup...
[debug] heap resized to 1048576 bytes
[debug] stack bottom is 0x7fff73d7e160.
[debug] entering toplevel toplevel...
[debug] entering toplevel library_toplevel...
[debug] entering toplevel build_2dversion_toplevel...
[debug] entering toplevel eval_toplevel...
[debug] resizing mutation-stack from 8k to 16k ...
[debug] entering toplevel expand_toplevel...
[debug] entering toplevel modules_toplevel...
[debug] resizing mutation-stack from 16k to 32k ...
[debug] entering toplevel extras_toplevel...
[debug] entering toplevel data_2dstructures_toplevel...
[debug] entering toplevel ports_toplevel...
[debug] entering toplevel srfi_2d69_toplevel...
[debug] entering toplevel srfi_2d1_toplevel...

 Adding edges (List in hash-table)
[debug] resizing heap dynamically from 1024k to 2048k ...
[debug] resizing heap dynamically from 2048k to 4096k ...
[debug] resizing heap dynamically from 4096k to 8192k ...
[debug] resizing heap dynamically from 8192k to 16384k ...
[debug] resizing heap dynamically from 16384k to 32768k ...
[debug] resizing heap dynamically from 32768k to 65536k ...
[debug] resizing heap dynamically from 65536k to 131072k ...
[debug] resizing heap dynamically from 131072k to 262144k ...
[debug] resizing heap dynamically from 262144k to 524288k ...
[debug] resizing heap dynamically from 524288k to 1048576k ...
[debug] resizing heap dynamically from 1048576k to 2097151k ...

Error: call of non-procedure: #<hash-table (22308)>

	Call history:

	implementations.scm:116: g	  
	implementations.scm:114: g172	  
	implementations.scm:15: hash-table-update!/default	  
	implementations.scm:116: g	  
	implementations.scm:114: g172	  
	implementations.scm:15: hash-table-update!/default	  
	implementations.scm:116: g	  
	implementations.scm:114: g172	  
	implementations.scm:15: hash-table-update!/default	  
	implementations.scm:116: g	  
	implementations.scm:114: g172	  
	implementations.scm:15: hash-table-update!/default	  
	implementations.scm:116: g	  
	implementations.scm:114: g172	  
	implementations.scm:15: hash-table-update!/default	  
	implementations.scm:116: g	  	<--