compiler: blank ident - consolidate duplicated code into single function

vlib/compiler/comptime.v

@@ -185,7 +185,7 @@ fn (p mut Parser) chash() {
 			flag = flag.replace('@VROOT', p.vroot)
 			flag = flag.replace('@VMOD', v_modules_path)
 			//p.log('adding flag "$flag"')
-			_p := p.table.parse_cflag(flag, p.mod) or {
+			_ = p.table.parse_cflag(flag, p.mod) or {
 				p.error_with_token_index(err, p.cur_tok_index()-1)
 				return
 			}

vlib/compiler/gen_c.v

@@ -93,21 +93,11 @@ fn (p mut Parser) gen_blank_identifier_assign() {
 	p.check_name()
 	p.check_space(.assign)
 	is_indexer := p.peek() == .lsbr
-	mut expr := p.lit
+	is_fn_call, next_expr := p.is_next_expr_fn_call()
-	mut is_fn_call := p.peek() == .lpar 
-	if !is_fn_call {
-		mut i := p.token_idx+1
-		for (p.tokens[i].tok == .dot || p.tokens[i].tok == .name) &&
-			p.tokens[i].lit != '_' {
-			expr += if p.tokens[i].tok == .dot { '.' } else { p.tokens[i].lit }
-			i++
-		}
-		is_fn_call = p.tokens[i].tok == .lpar
-	}
 	pos := p.cgen.add_placeholder()
 	mut typ := p.bool_expression()
 	if !is_indexer && !is_fn_call {
-		p.error_with_token_index('assigning `$expr` to `_` is redundant', assign_error_tok_idx)
+		p.error_with_token_index('assigning `$next_expr` to `_` is redundant', assign_error_tok_idx)
 	}
 	tmp := p.get_tmp()
 	// handle or

vlib/compiler/gen_js.v

@@ -39,20 +39,10 @@ fn (p mut Parser) gen_blank_identifier_assign() {
 	p.check_name()
 	p.check_space(.assign)
 	is_indexer := p.peek() == .lsbr
-	mut expr := p.lit
+	is_fn_call, next_expr := p.is_next_expr_fn_call()
-	mut is_fn_call := p.peek() == .lpar 
-	if !is_fn_call {
-		mut i := p.token_idx+1
-		for (p.tokens[i].tok == .dot || p.tokens[i].tok == .name) &&
-			p.tokens[i].lit != '_' {
-			expr += if p.tokens[i].tok == .dot { '.' } else { p.tokens[i].lit }
-			i++
-		}
-		is_fn_call = p.tokens[i].tok == .lpar
-	}
 	p.bool_expression()
 	if !is_indexer && !is_fn_call {
-		p.error_with_token_index('assigning `$expr` to `_` is redundant', assign_error_tok_idx)
+		p.error_with_token_index('assigning `$next_expr` to `_` is redundant', assign_error_tok_idx)
 	}
 	or_else := p.tok == .key_orelse
 	//tmp := p.get_tmp()

vlib/compiler/parser.v

@@ -4209,3 +4209,18 @@ fn (p mut Parser) check_unused_imports() {
 	 // the imports are usually at the start of the file
 	p.production_error_with_token_index( 'the following imports were never used: $output', 0 )
 }
+
+fn (p mut Parser) is_next_expr_fn_call() (bool, string) {
+	mut next_expr := p.lit
+	mut is_fn_call := p.peek() == .lpar 
+	if !is_fn_call {
+		mut i := p.token_idx+1
+		for (p.tokens[i].tok == .dot || p.tokens[i].tok == .name) &&
+			p.tokens[i].lit != '_' && i < p.tokens.len {
+			next_expr += if p.tokens[i].tok == .dot { '.' } else { p.tokens[i].lit }
+			i++
+		}
+		is_fn_call = p.tokens[i].tok == .lpar
+	}
+	return is_fn_call, next_expr
+}