Provenance gives `Relation not found` error for relations with record types.

[MarkMizzi]

Here is a minimal example:

// file provenance_test.dl

.type T = [ x:number ]

.decl E(x:T, y:T)
.output E

E([1], [2]).

When invoking souffle with explain, the following behaviour is observed:

-> % souffle -t explain provenance_test.dl
Explain is invoked.
Enter command > explain E([1], [2])
Relation not found

Souffle version is 2.3 running on vanilla Ubuntu 22.04.

[quentin]

The interactive provenance only supports numeric literals and symbol:

souffle/src/include/souffle/provenance/Explain.h

Lines 302 to 308 in 0d75dc3

	// regex for matching tuples
	// values matches numbers or strings enclosed in quotation marks
	std::regex relationRegex(
	"([a-zA-Z0-9_.-]*)[[:blank:]]*\\(([[:blank:]]*([0-9]+|\"[^\"]*\")([[:blank:]]*,[[:blank:]]*(["
	"0-"
	"9]+|\"[^\"]*\"))*)?\\)",
	std::regex_constants::extended);