checker: fix const variable type error when global variable with the same name exists (fix #15686) (#15689)

vlib/v/checker/checker.v

@@ -2739,6 +2739,7 @@ pub fn (mut c Checker) ident(mut node ast.Ident) ast.Type {
 		if mut obj := node.scope.find(node.name) {
 			match mut obj {
 				ast.GlobalField {
+					if node.mod == '' {
 						node.kind = .global
 						node.info = ast.IdentVar{
 							typ: obj.typ
@@ -2746,6 +2747,7 @@ pub fn (mut c Checker) ident(mut node ast.Ident) ast.Type {
 						node.obj = obj
 						return obj.typ
 					}
+				}
 				ast.Var {
 					// inside vweb tmpl ident positions are meaningless, use the position of the comptime call.
 					// if the variable is declared before the comptime call then we can assume all is well.

vlib/v/tests/const_and_global_with_same_name_test.v

@@ -0,0 +1,11 @@
+[has_globals]
+module main
+
+import time
+
+__global seconds_per_minute = 'sixty'
+
+fn test_const_and_globals_with_the_same_name_in_different_modules_do_not_conflict() {
+	assert seconds_per_minute == 'sixty'
+	assert time.seconds_per_minute == 60
+}