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improve error message on re-definition of a constant

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svn: r7907
This commit is contained in:
Matthew Flatt 2007-12-06 21:49:17 +00:00
parent ac5e43ffb3
commit 6b949a190c
1 changed files with 6 additions and 1 deletions
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7
src/mzscheme/src/syntax.c
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@ -617,17 +617,22 @@ void scheme_set_global_bucket(char *who, Scheme_Bucket *b, Scheme_Object *val,
else {
if (((Scheme_Bucket_With_Home *)b)->home->module) {
const char *msg;
int is_set;
if (SCHEME_TRUEP(scheme_get_param(scheme_current_config(), MZCONFIG_ERROR_PRINT_SRCLOC)))
msg = "%s: cannot %s: %S in module: %D";
else
msg = "%s: cannot %s: %S";
is_set = !strcmp(who, "set!");
scheme_raise_exn(MZEXN_FAIL_CONTRACT_VARIABLE, b->key,
msg,
who,
(b->val
? "change identifier that is instantiated as a module constant"
? (is_set
? "modify a constant"
: "re-define a constant")
: "set identifier before its definition"),
(Scheme_Object *)b->key,
((Scheme_Bucket_With_Home *)b)->home->module->modname);