Annotation of /branches/vis12/bugs/resolved/bug002.diderot

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Revision 2146 - (view) (download)
Original Path: branches/vis12/bugs/bug002.diderot

1 :	glk	2146	/****************
2 :			(there are two programs here; uncomment one)
3 :
4 :			Compiling this program gives:
5 :			[sqr-bug02.diderot:22.32-38] Error: undeclared variable 'foobar'
6 :			uncaught exception Fail [Fail: Error in compiling sqr-bug02.diderot]
7 :			raised at common/phase-timer.sml:76.50-76.52
8 :			raised at common/phase-timer.sml:76.50-76.52
9 :			raised at driver/main.sml:27.39-27.76
10 :
11 :			So there is both the "Error" and the "Fail".
12 :			When there is a descriptive Error message, why have
13 :			all the uncaught exception stuff?
14 :
15 :			****************/
16 :
17 :			real eps = 1.0;
18 :			strand sqroot(real val) {
19 :			output real root = val;
20 :			update {
21 :			root = (root + val/root)/2;
22 :			if (|root^2 - val|/val < foobar)
23 :			stabilize;
24 :			}
25 :			}
26 :			// Strand initialization
27 :			initially { sqroot(i) | i in 1..1000 };
28 :
29 :
30 :			/****************
31 :
32 :			But compiling this program gives:
33 :			...
34 :			mid-il DFA: cpu = 0.000 seconds, gc = 0.000 seconds, 4 nodes, 3 visits, 1 iterations
35 :			low-il DFA: cpu = 0.000 seconds, gc = 0.000 seconds, 3 nodes, 2 visits, 1 iterations
36 :			low-il DFA: cpu = 0.000 seconds, gc = 0.000 seconds, 3 nodes, 2 visits, 1 iterations
37 :			low-il DFA: cpu = 0.000 seconds, gc = 0.000 seconds, 18 nodes, 17 visits, 1 iterations
38 :			low-il DFA: cpu = 0.000 seconds, gc = 0.000 seconds, 4 nodes, 3 visits, 1 iterations
39 :			uncaught exception Fail [Fail: no output specified for strand sqroot]
40 :			raised at common/phase-timer.sml:76.50-76.52
41 :			raised at common/phase-timer.sml:76.50-76.52
42 :			raised at c-target/c-target.sml:151.37-151.83
43 :
44 :			So there is actually a descriptive error message in the "Fail", but
45 :			there's no "Error". Why not put descriptive error messages in "Error",
46 :			and let the "uncaught exception" signify bugs in the compiler?
47 :			****************/
48 :			/*
49 :			real eps = 1.0;
50 :			strand sqroot(real val) {
51 :			real root = val;
52 :			update {
53 :			root = (root + val/root)/2;
54 :			if (|root^2 - val|/val < eps)
55 :			stabilize;
56 :			}
57 :			}
58 :			// Strand initialization
59 :			initially { sqroot(i) | i in 1..1000 };
60 :			*/

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